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Code Issues Releases Wiki Activity

- Markus Moeller introduced two new options to libcurl:

Browse Source 
CURLOPT_SOCKS5_GSSAPI_SERVICE and CURLOPT_SOCKS5_GSSAPI_NEC to allow libcurl
  to do GSS-style authentication with SOCKS5 proxies. The curl tool got the
  options called --socks5-gssapi-service and --socks5-gssapi-nec to enable
  these.
This commit is contained in:
Daniel Stenberg 2009-01-28 21:33:58 +00:00
parent 6e34c2d59a
commit de4610a55f
17 changed files with 1403 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
CHANGES
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@ -6,6 +6,13 @@
Changelog
Daniel Stenberg (28 Jan 2009)
- Markus Moeller introduced two new options to libcurl:
CURLOPT_SOCKS5_GSSAPI_SERVICE and CURLOPT_SOCKS5_GSSAPI_NEC to allow libcurl
to do GSS-style authentication with SOCKS5 proxies. The curl tool got the
options called --socks5-gssapi-service and --socks5-gssapi-nec to enable
these.
Daniel Stenberg (26 Jan 2009)
- Chad Monroe provided the new CURLOPT_TFTP_BLKSIZE option that allows an app
to set desired block size to use for TFTP transfers instead of the default

9
RELEASE-NOTES
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@ -1,8 +1,8 @@
Curl and libcurl 7.19.4
Public curl releases: 110
Command line options: 129
curl_easy_setopt() options: 159
Command line options: 131
curl_easy_setopt() options: 161
Public functions in libcurl: 58
Known libcurl bindings: 37
Contributors: 700
@ -13,6 +13,9 @@ This release includes the following changes:
o the OpenSSL-specific code disables TICKET (rfc5077) which is enabled by
default in openssl 0.9.8j
o Added CURLOPT_TFTP_BLKSIZE
o Added CURLOPT_SOCKS5_GSSAPI_SERVICE and CURLOPT_SOCKS5_GSSAPI_NEC - with
the corresponding curl options --socks5-gssapi-service and
--socks5-gssapi-nec
This release includes the following bugfixes:
@ -28,6 +31,6 @@ This release would not have looked like this without help, code, reports and
advice from friends like these:
Lisa Xu, Daniel Fandrich, Craig A West, Alexey Borzov, Sharad Gupta,
Peter Sylvester, Chad Monroe
Peter Sylvester, Chad Monroe, Markus Moeller
Thanks! (and sorry if I forgot to mention someone)

2
TODO-RELEASE
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@ -3,8 +3,6 @@ To be addressed in 7.19.4 (planned release: March 2009)
206 - A. Craig West's CURLOPT_HTTP_VERSION change for CONNECT
208 - Patch to allow GSSAPI authentication to a socks5 server
214 - progress bar prefix, second try (for the curl tool)
215 - Patch for Metalink Support (for the curl tool)

17
docs/curl.1
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@ -821,7 +821,7 @@ The only wildcard is a single * character, which matches all hosts, and
effectively disables the proxy. Each name in this list is matched as either
a domain which contains the hostname, or the hostname itself. For example,
local.com would match local.com, local.com:80, and www.local.com, but not
www.notlocal.com.
www.notlocal.com. (Added in 7.19.4).
.IP "--ntlm"
(HTTP) Enables NTLM authentication. The NTLM authentication method was
designed by Microsoft and is used by IIS web servers. It is a proprietary
@ -1114,6 +1114,21 @@ mutually exclusive.
If this option is used several times, the last one will be used. (This option
was previously wrongly documented and used as --socks without the number
appended.)
.IP "--socks5-gssapi-service <servicename>"
The default service name for a socks server is rcmd/server-fqdn. This option
allows you to change it.
Examples:
--socks5 proxy-name \fI--socks5-gssapi-service\fP sockd would use
sockd/proxy-name
--socks5 proxy-name \fI--socks5-gssapi-service\fP sockd/real-name would use
sockd/real-name for cases where the proxy-name does not match the princpal name.
(Added in 7.19.4).
.IP "--socks5-gssapi-nec"
As part of the gssapi negotiation a protection mode is negotiated. The rfc1961
says in section 4.3/4.4 it should be protected, but the NEC reference
implementation does not. The option \fI--socks5-gssapi-nec\fP allows the
unprotected exchange of the protection mode negotiation. (Added in 7.19.4).
.IP "--stderr <file>"
Redirect all writes to stderr to the specified file instead. If the file name
is a plain '-', it is instead written to stdout. This option has no point when

10
docs/libcurl/curl_easy_setopt.3
View File

@ -487,6 +487,16 @@ Set the parameter to 1 to make the library tunnel all operations through a
given HTTP proxy. There is a big difference between using a proxy and to
tunnel through it. If you don't know what this means, you probably don't want
this tunneling option.
.IP CURLOPT_SOCKS5_GSSAPI_SERVICE
Pass a char * as parameter to a string holding the name of the service. The
default service name for a SOCKS5 server is rcmd/server-fqdn. This option
allows you to change it. (Added in 7.19.4)
.IP CURLOPT_SOCKS5_GSSAPI_NEC
Pass a long set to 1 to enable or 0 to disable. As part of the gssapi
negotiation a protection mode is negotiated. The rfc1961 says in section
4.3/4.4 it should be protected, but the NEC reference implementation does not.
If enabled, this option allows the unprotected exchange of the protection mode
negotiation. (Added in 7.19.4).
.IP CURLOPT_INTERFACE
Pass a char * as parameter. This sets the interface name to use as outgoing
network interface. The name can be an interface name, an IP address, or a host

6
include/curl/curl.h
View File

@ -1162,6 +1162,12 @@ typedef enum {
/* block size for TFTP transfers */
CINIT(TFTP_BLKSIZE, LONG, 178),
/* Socks Service */
CINIT(SOCKS5_GSSAPI_SERVICE, LONG, 179),
/* Socks Service */
CINIT(SOCKS5_GSSAPI_NEC, LONG, 180),
CURLOPT_LASTENTRY /* the last unused */
} CURLoption;

3
lib/Makefile.inc
View File

@ -9,7 +9,8 @@ CSOURCES = file.c timeval.c base64.c hostip.c progress.c formdata.c \
http_negotiate.c http_ntlm.c inet_pton.c strtoofft.c strerror.c \
hostares.c hostasyn.c hostip4.c hostip6.c hostsyn.c hostthre.c \
inet_ntop.c parsedate.c select.c gtls.c sslgen.c tftp.c splay.c \
strdup.c socks.c ssh.c nss.c qssl.c rawstr.c curl_addrinfo.c
strdup.c socks.c ssh.c nss.c qssl.c rawstr.c curl_addrinfo.c \
socks_gssapi.c socks_sspi.c
HHEADERS = arpa_telnet.h netrc.h file.h timeval.h qssl.h hostip.h \
progress.h formdata.h cookie.h http.h sendf.h ftp.h url.h dict.h \

3
lib/Makefile.vc6
View File

@ -101,7 +101,7 @@ LFLAGS = /nologo /machine:$(MACHINE)
SSLLIBS = libeay32.lib ssleay32.lib
ZLIBLIBSDLL= zdll.lib
ZLIBLIBS = zlib.lib
WINLIBS = wsock32.lib wldap32.lib
WINLIBS = wsock32.lib wldap32.lib secur32.lib
CFLAGS = $(CFLAGS)
CFGSET = FALSE
@ -489,6 +489,7 @@ X_OBJS= \
$(DIROBJ)\sendf.obj \
$(DIROBJ)\share.obj \
$(DIROBJ)\socks.obj \
$(DIROBJ)\socks_sspi.obj \
$(DIROBJ)\speedcheck.obj \
$(DIROBJ)\splay.obj \
$(DIROBJ)\ssh.obj \

78
lib/socks.c
View File

@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2009, 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
@ -60,14 +60,14 @@
* This is STUPID BLOCKING behaviour which we frown upon, but right now this
* is what we have...
*/
static int blockread_all(struct connectdata *conn, /* connection data */
curl_socket_t sockfd, /* read from this socket */
char *buf, /* store read data here */
ssize_t buffersize, /* max amount to read */
ssize_t *n, /* amount bytes read */
long conn_timeout) /* timeout for data wait
relative to
conn->created */
int Curl_blockread_all(struct connectdata *conn, /* connection data */
curl_socket_t sockfd, /* read from this socket */
char *buf, /* store read data here */
ssize_t buffersize, /* max amount to read */
ssize_t *n, /* amount bytes read */
long conn_timeout) /* timeout for data wait
relative to
conn->created */
{
ssize_t nread;
ssize_t allread = 0;
@ -264,7 +264,7 @@ CURLcode Curl_SOCKS4(const char *proxy_name,
packetsize = 8; /* receive data size */
/* Receive response */
result = blockread_all(conn, sock, (char *)socksreq, packetsize,
result = Curl_blockread_all(conn, sock, (char *)socksreq, packetsize,
&actualread, timeout);
if((result != CURLE_OK) || (actualread != packetsize)) {
failf(data, "Failed to receive SOCKS4 connect request ack.");
@ -429,9 +429,16 @@ CURLcode Curl_SOCKS5(const char *proxy_name,
}
socksreq[0] = 5; /* version */
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
socksreq[1] = (char)(proxy_name ? 3 : 2); /* number of methods (below) */
socksreq[2] = 0; /* no authentication */
socksreq[3] = 1; /* gssapi */
socksreq[4] = 2; /* username/password */
#else
socksreq[1] = (char)(proxy_name ? 2 : 1); /* number of methods (below) */
socksreq[2] = 0; /* no authentication */
socksreq[3] = 2; /* username/password */
#endif
Curl_nonblock(sock, FALSE);
@ -462,7 +469,8 @@ CURLcode Curl_SOCKS5(const char *proxy_name,
Curl_nonblock(sock, FALSE);
result=blockread_all(conn, sock, (char *)socksreq, 2, &actualread, timeout);
result=Curl_blockread_all(conn, sock, (char *)socksreq, 2, &actualread,
timeout);
if((result != CURLE_OK) || (actualread != 2)) {
failf(data, "Unable to receive initial SOCKS5 response.");
return CURLE_COULDNT_CONNECT;
@ -476,6 +484,15 @@ CURLcode Curl_SOCKS5(const char *proxy_name,
/* Nothing to do, no authentication needed */
;
}
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
else if(socksreq[1] == 1) {
code = Curl_SOCKS5_gssapi_negotiate(sockindex, conn);
if(code != CURLE_OK) {
failf(data, "Unable to negotiate SOCKS5 gssapi context.");
return CURLE_COULDNT_CONNECT;
}
}
#endif
else if(socksreq[1] == 2) {
/* Needs user name and password */
size_t userlen, pwlen;
@ -511,7 +528,7 @@ CURLcode Curl_SOCKS5(const char *proxy_name,
return CURLE_COULDNT_CONNECT;
}
result=blockread_all(conn, sock, (char *)socksreq, 2, &actualread,
result=Curl_blockread_all(conn, sock, (char *)socksreq, 2, &actualread,
timeout);
if((result != CURLE_OK) || (actualread != 2)) {
failf(data, "Unable to receive SOCKS5 sub-negotiation response.");
@ -529,12 +546,16 @@ CURLcode Curl_SOCKS5(const char *proxy_name,
}
else {
/* error */
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
if(socksreq[1] == 255) {
#else
if(socksreq[1] == 1) {
failf(data,
"SOCKS5 GSSAPI per-message authentication is not supported.");
return CURLE_COULDNT_CONNECT;
}
else if(socksreq[1] == 255) {
#endif
if(!proxy_name || !*proxy_name) {
failf(data,
"No authentication method was acceptable. (It is quite likely"
@ -616,6 +637,11 @@ CURLcode Curl_SOCKS5(const char *proxy_name,
*((unsigned short*)&socksreq[8]) = htons((unsigned short)remote_port);
}
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
if(conn->socks5_gssapi_enctype) {
failf(data, "SOCKS5 gssapi protection not yet implemented.");
} else
#endif
code = Curl_write_plain(conn, sock, (char *)socksreq, packetsize, &written);
if((code != CURLE_OK) || (written != packetsize)) {
failf(data, "Failed to send SOCKS5 connect request.");
@ -624,7 +650,12 @@ CURLcode Curl_SOCKS5(const char *proxy_name,
packetsize = 10; /* minimum packet size is 10 */
result = blockread_all(conn, sock, (char *)socksreq, packetsize,
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
if(conn->socks5_gssapi_enctype) {
failf(data, "SOCKS5 gssapi protection not yet implemented.");
} else
#endif
result = Curl_blockread_all(conn, sock, (char *)socksreq, packetsize,
&actualread, timeout);
if((result != CURLE_OK) || (actualread != packetsize)) {
failf(data, "Failed to receive SOCKS5 connect request ack.");
@ -674,15 +705,22 @@ CURLcode Curl_SOCKS5(const char *proxy_name,
}
/* At this point we already read first 10 bytes */
if(packetsize > 10) {
packetsize -= 10;
result = blockread_all(conn, sock, (char *)&socksreq[10], packetsize,
&actualread, timeout);
if((result != CURLE_OK) || (actualread != packetsize)) {
failf(data, "Failed to receive SOCKS5 connect request ack.");
return CURLE_COULDNT_CONNECT;
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
if(!conn->socks5_gssapi_enctype) {
/* decrypt_gssapi_blockread already read the whole packet */
#endif
if(packetsize > 10) {
packetsize -= 10;
result = Curl_blockread_all(conn, sock, (char *)&socksreq[10],
packetsize, &actualread, timeout);
if((result != CURLE_OK) || (actualread != packetsize)) {
failf(data, "Failed to receive SOCKS5 connect request ack.");
return CURLE_COULDNT_CONNECT;
}
}
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
}
#endif
Curl_nonblock(sock, TRUE);
return CURLE_OK; /* Proxy was successful! */

24
lib/socks.h
View File

@ -7,7 +7,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2009, 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
@ -23,6 +23,20 @@
* $Id$
***************************************************************************/
/*
* Helper read-from-socket functions. Does the same as Curl_read() but it
* blocks until all bytes amount of buffersize will be read. No more, no less.
*
* This is STUPID BLOCKING behaviour which we frown upon, but right now this
* is what we have...
*/
int Curl_blockread_all(struct connectdata *conn,
curl_socket_t sockfd,
char *buf,
ssize_t buffersize,
ssize_t *n,
long conn_timeout);
/*
* This function logs in to a SOCKS4(a) proxy and sends the specifics to the
* final destination server.
@ -45,4 +59,12 @@ CURLcode Curl_SOCKS5(const char *proxy_name,
int sockindex,
struct connectdata *conn);
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
/*
* This function handles the sockss5 gssapie negotiation and initialisation
*/
CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex,
struct connectdata *conn);
#endif
#endif /* __SOCKS_H */

547
lib/socks_gssapi.c Normal file
View File

@ -0,0 +1,547 @@
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2009, Markus Moeller, <markus_moeller@compuserve.com>
*
* 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"
#ifdef HAVE_GSSAPI
#ifdef HAVE_OLD_GSSMIT
#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
#endif
#ifndef gss_nt_service_name
#define gss_nt_service_name GSS_C_NT_HOSTBASED_SERVICE
#endif
#include <string.h>
#ifdef NEED_MALLOC_H
#include <malloc.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "urldata.h"
#include "sendf.h"
#include "connect.h"
#include "timeval.h"
#include "socks.h"
static gss_ctx_id_t gss_context = GSS_C_NO_CONTEXT;
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#include "memdebug.h"
/*
* Helper gssapi error functions.
*/
static int check_gss_err(struct SessionHandle *data,
OM_uint32 major_status,
OM_uint32 minor_status,
const char* function)
{
if(GSS_ERROR(major_status)) {
OM_uint32 maj_stat,min_stat;
OM_uint32 msg_ctx = 0;
gss_buffer_desc status_string;
char buf[1024];
size_t len;
len = 0;
msg_ctx = 0;
while(!msg_ctx) {
/* convert major status code (GSS-API error) to text */
maj_stat = gss_display_status(&min_stat, major_status,
GSS_C_GSS_CODE,
GSS_C_NULL_OID,
&msg_ctx, &status_string);
if(maj_stat == GSS_S_COMPLETE) {
if(sizeof(buf) > len + status_string.length + 1) {
strcpy(buf+len, (char*) status_string.value);
len += status_string.length;
}
gss_release_buffer(&min_stat, &status_string);
break;
}
gss_release_buffer(&min_stat, &status_string);
}
if(sizeof(buf) > len + 3) {
strcpy(buf+len, ".\n");
len += 2;
}
msg_ctx = 0;
while(!msg_ctx) {
/* convert minor status code (underlying routine error) to text */
maj_stat = gss_display_status(&min_stat, minor_status,
GSS_C_MECH_CODE,
GSS_C_NULL_OID,
&msg_ctx, &status_string);
if(maj_stat == GSS_S_COMPLETE) {
if(sizeof(buf) > len + status_string.length) {
strcpy(buf+len, (char*) status_string.value);
len += status_string.length;
}
gss_release_buffer(&min_stat, &status_string);
break;
}
gss_release_buffer(&min_stat, &status_string);
}
failf(data, "GSSAPI error: %s failed:\n%s\n", function, buf);
return(1);
}
return(0);
}
CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex,
struct connectdata *conn)
{
struct SessionHandle *data = conn->data;
curl_socket_t sock = conn->sock[sockindex];
CURLcode code;
ssize_t actualread;
ssize_t written;
int result;
long timeout;
OM_uint32 gss_major_status, gss_minor_status, gss_status;
OM_uint32 gss_ret_flags;
int gss_conf_state, gss_enc;
gss_buffer_desc service = GSS_C_EMPTY_BUFFER;
gss_buffer_desc gss_send_token = GSS_C_EMPTY_BUFFER;
gss_buffer_desc gss_recv_token = GSS_C_EMPTY_BUFFER;
gss_buffer_desc gss_w_token = GSS_C_EMPTY_BUFFER;
gss_buffer_desc* gss_token = GSS_C_NO_BUFFER;
gss_name_t server = GSS_C_NO_NAME;
gss_name_t gss_client_name = GSS_C_NO_NAME;
u_short us_length;
char *user=NULL;
unsigned char socksreq[4]; /* room for gssapi exchange header only */
char *serviceptr = data->set.str[STRING_SOCKS5_GSSAPI_SERVICE];
/* get timeout */
timeout = Curl_timeleft(conn, NULL, TRUE);
/* GSSAPI request looks like
* +----+------+-----+----------------+
* |VER | MTYP | LEN | TOKEN |
* +----+------+----------------------+
* | 1 | 1 | 2 | up to 2^16 - 1 |
* +----+------+-----+----------------+
*/
/* prepare service name */
if (strchr(serviceptr,'/')) {
service.value = malloc(strlen(serviceptr));
if(!service.value)
return CURLE_OUT_OF_MEMORY;
service.length = strlen(serviceptr);
memcpy(service.value, serviceptr, service.length);
gss_major_status = gss_import_name(&gss_minor_status, &service,
(gss_OID) GSS_C_NULL_OID, &server);
}
else {
service.value = malloc(strlen(serviceptr) +strlen(conn->proxy.name)+2);
if(!service.value)
return CURLE_OUT_OF_MEMORY;
service.length = strlen(serviceptr) +strlen(conn->proxy.name)+1;
snprintf(service.value, service.length+1, "%s@%s",
serviceptr, conn->proxy.name);
gss_major_status = gss_import_name(&gss_minor_status, &service,
gss_nt_service_name, &server);
}
gss_release_buffer(&gss_status, &service); /* clear allocated memory */
if(check_gss_err(data,gss_major_status,
gss_minor_status,"gss_import_name()")) {
failf(data, "Failed to create service name.");
gss_release_name(&gss_status, &server);
return CURLE_COULDNT_CONNECT;
}
/* As long as we need to keep sending some context info, and there's no */
/* errors, keep sending it... */
for(;;) {
gss_major_status = gss_init_sec_context(&gss_minor_status,
GSS_C_NO_CREDENTIAL,
&gss_context, server,
GSS_C_NULL_OID,
GSS_C_MUTUAL_FLAG |
GSS_C_REPLAY_FLAG,
0,
NULL,
gss_token,
NULL,
&gss_send_token,
&gss_ret_flags,
NULL);
if(gss_token != GSS_C_NO_BUFFER)
gss_release_buffer(&gss_status, &gss_recv_token);
if(check_gss_err(data,gss_major_status,
gss_minor_status,"gss_init_sec_context")) {
gss_release_name(&gss_status, &server);
gss_release_buffer(&gss_status, &gss_recv_token);
gss_release_buffer(&gss_status, &gss_send_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
failf(data, "Failed to initial GSSAPI token.");
return CURLE_COULDNT_CONNECT;
}
if(gss_send_token.length != 0) {
socksreq[0] = 1; /* gssapi subnegotiation version */
socksreq[1] = 1; /* authentication message type */
us_length = htons((short)gss_send_token.length);
memcpy(socksreq+2,&us_length,sizeof(short));
code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
if((code != CURLE_OK) || (4 != written)) {
failf(data, "Failed to send GSSAPI authentication request.");
gss_release_name(&gss_status, &server);
gss_release_buffer(&gss_status, &gss_recv_token);
gss_release_buffer(&gss_status, &gss_send_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
code = Curl_write_plain(conn, sock, (char *)gss_send_token.value,
gss_send_token.length, &written);
if((code != CURLE_OK) || ((ssize_t)gss_send_token.length != written)) {
failf(data, "Failed to send GSSAPI authentication token.");
gss_release_name(&gss_status, &server);
gss_release_buffer(&gss_status, &gss_recv_token);
gss_release_buffer(&gss_status, &gss_send_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
}
gss_release_buffer(&gss_status, &gss_send_token);
gss_release_buffer(&gss_status, &gss_recv_token);
if(gss_major_status != GSS_S_CONTINUE_NEEDED) break;
/* analyse response */
/* GSSAPI response looks like
* +----+------+-----+----------------+
* |VER | MTYP | LEN | TOKEN |
* +----+------+----------------------+
* | 1 | 1 | 2 | up to 2^16 - 1 |
* +----+------+-----+----------------+
*/
result=Curl_blockread_all(conn, sock, (char *)socksreq, 4,
&actualread, timeout);
if(result != CURLE_OK || actualread != 4) {
failf(data, "Failed to receive GSSAPI authentication response.");
gss_release_name(&gss_status, &server);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
/* ignore the first (VER) byte */
if(socksreq[1] == 255) { /* status / message type */
failf(data, "User was rejected by the SOCKS5 server (%d %d).",
socksreq[0], socksreq[1]);
gss_release_name(&gss_status, &server);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
if(socksreq[1] != 1) { /* status / messgae type */
failf(data, "Invalid GSSAPI authentication response type (%d %d).",
socksreq[0], socksreq[1]);
gss_release_name(&gss_status, &server);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
memcpy(&us_length, socksreq+2, sizeof(short));
us_length = ntohs(us_length);
gss_recv_token.length=us_length;
gss_recv_token.value=malloc(us_length);
if(!gss_recv_token.value) {
failf(data,
"Could not allocate memory for GSSAPI authentication "
"response token.");
gss_release_name(&gss_status, &server);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_OUT_OF_MEMORY;
}
result=Curl_blockread_all(conn, sock, (char *)gss_recv_token.value,
gss_recv_token.length,
&actualread, timeout);
if(result != CURLE_OK || actualread != us_length) {
failf(data, "Failed to receive GSSAPI authentication token.");
gss_release_name(&gss_status, &server);
gss_release_buffer(&gss_status, &gss_recv_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
gss_token = &gss_recv_token;
}
gss_release_name(&gss_status, &server);
/* Everything is good so far, user was authenticated! */
gss_major_status = gss_inquire_context (&gss_minor_status, gss_context,
&gss_client_name, NULL, NULL, NULL,
NULL, NULL, NULL);
if(check_gss_err(data,gss_major_status,
gss_minor_status,"gss_inquire_context")) {
gss_delete_sec_context(&gss_status, &gss_context, NULL);
gss_release_name(&gss_status, &gss_client_name);
failf(data, "Failed to determine user name.");
return CURLE_COULDNT_CONNECT;
}
gss_major_status = gss_display_name(&gss_minor_status, gss_client_name,
&gss_send_token, NULL);
if(check_gss_err(data,gss_major_status,
gss_minor_status,"gss_display_name")) {
gss_delete_sec_context(&gss_status, &gss_context, NULL);
gss_release_name(&gss_status, &gss_client_name);
gss_release_buffer(&gss_status, &gss_send_token);
failf(data, "Failed to determine user name.");
return CURLE_COULDNT_CONNECT;
}
user=malloc(gss_send_token.length+1);
if(!user) {
gss_delete_sec_context(&gss_status, &gss_context, NULL);
gss_release_name(&gss_status, &gss_client_name);
gss_release_buffer(&gss_status, &gss_send_token);
return CURLE_OUT_OF_MEMORY;
}
memcpy(user, gss_send_token.value, gss_send_token.length);
user[gss_send_token.length] = '\0';
gss_release_name(&gss_status, &gss_client_name);
gss_release_buffer(&gss_status, &gss_send_token);
infof(data, "SOCKS5 server authencticated user %s with gssapi.\n",user);
free(user);
user=NULL;
/* Do encryption */
socksreq[0] = 1; /* gssapi subnegotiation version */
socksreq[1] = 2; /* encryption message type */
gss_enc = 0; /* no data protection */
/* do confidentiality protection if supported */
if(gss_ret_flags & GSS_C_CONF_FLAG)
gss_enc = 2;
/* else do integrity protection */
else if(gss_ret_flags & GSS_C_INTEG_FLAG)
gss_enc = 1;
infof(data, "SOCKS5 server supports gssapi %s data protection.\n",
(gss_enc==0)?"no":((gss_enc==1)?"integrity":"confidentiality"));
/* force for the moment to no data protection */
gss_enc = 0;
/*
* Sending the encryption type in clear seems wrong. It should be
* protected with gss_seal()/gss_wrap(). See RFC1961 extract below
* The NEC reference implementations on which this is based is
* therefore at fault
*
* +------+------+------+.......................+
* + ver | mtyp | len | token |
* +------+------+------+.......................+
* + 0x01 | 0x02 | 0x02 | up to 2^16 - 1 octets |
* +------+------+------+.......................+
*
* Where:
*
* - "ver" is the protocol version number, here 1 to represent the
* first version of the SOCKS/GSS-API protocol
*
* - "mtyp" is the message type, here 2 to represent a protection
* -level negotiation message
*
* - "len" is the length of the "token" field in octets
*
* - "token" is the GSS-API encapsulated protection level
*
* The token is produced by encapsulating an octet containing the
* required protection level using gss_seal()/gss_wrap() with conf_req
* set to FALSE. The token is verified using gss_unseal()/
* gss_unwrap().
*
*/
if(data->set.socks5_gssapi_nec) {
us_length = htons((short)1);
memcpy(socksreq+2,&us_length,sizeof(short));
}
else {
gss_send_token.length = 1;
gss_send_token.value = malloc(1);
if(!gss_send_token.value) {
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_OUT_OF_MEMORY;
}
memcpy(gss_send_token.value, &gss_enc, 1);
gss_major_status = gss_wrap(&gss_minor_status, gss_context, 0,
GSS_C_QOP_DEFAULT, &gss_send_token,
&gss_conf_state, &gss_w_token);
if(check_gss_err(data,gss_major_status,gss_minor_status,"gss_wrap")) {
gss_release_buffer(&gss_status, &gss_send_token);
gss_release_buffer(&gss_status, &gss_w_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
failf(data, "Failed to wrap GSSAPI encryption value into token.");
return CURLE_COULDNT_CONNECT;
}
gss_release_buffer(&gss_status, &gss_send_token);
us_length = htons((short)gss_w_token.length);
memcpy(socksreq+2,&us_length,sizeof(short));
}
code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
if((code != CURLE_OK) || (4 != written)) {
failf(data, "Failed to send GSSAPI encryption request.");
gss_release_buffer(&gss_status, &gss_w_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
if(data->set.socks5_gssapi_nec) {
memcpy(socksreq, &gss_enc, 1);
code = Curl_write_plain(conn, sock, socksreq, 1, &written);
if((code != CURLE_OK) || ( 1 != written)) {
failf(data, "Failed to send GSSAPI encryption type.");
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
} else {
code = Curl_write_plain(conn, sock, (char *)gss_w_token.value,
gss_w_token.length, &written);
if((code != CURLE_OK) || ((ssize_t)gss_w_token.length != written)) {
failf(data, "Failed to send GSSAPI encryption type.");
gss_release_buffer(&gss_status, &gss_w_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
gss_release_buffer(&gss_status, &gss_w_token);
}
result=Curl_blockread_all(conn, sock, (char *)socksreq, 4,
&actualread, timeout);
if(result != CURLE_OK || actualread != 4) {
failf(data, "Failed to receive GSSAPI encryption response.");
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
/* ignore the first (VER) byte */
if(socksreq[1] == 255) { /* status / message type */
failf(data, "User was rejected by the SOCKS5 server (%d %d).",
socksreq[0], socksreq[1]);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
if(socksreq[1] != 2) { /* status / messgae type */
failf(data, "Invalid GSSAPI encryption response type (%d %d).",
socksreq[0], socksreq[1]);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
memcpy(&us_length, socksreq+2, sizeof(short));
us_length = ntohs(us_length);
gss_recv_token.length= us_length;
gss_recv_token.value=malloc(gss_recv_token.length);
if(!gss_recv_token.value) {
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_OUT_OF_MEMORY;
}
result=Curl_blockread_all(conn, sock, (char *)gss_recv_token.value,
gss_recv_token.length,
&actualread, timeout);
if(result != CURLE_OK || actualread != us_length) {
failf(data, "Failed to receive GSSAPI encryptrion type.");
gss_release_buffer(&gss_status, &gss_recv_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
if(!data->set.socks5_gssapi_nec) {
gss_major_status = gss_unwrap(&gss_minor_status, gss_context,
&gss_recv_token, &gss_w_token,
0, GSS_C_QOP_DEFAULT);
if(check_gss_err(data,gss_major_status,gss_minor_status,"gss_unwrap")) {
gss_release_buffer(&gss_status, &gss_recv_token);
gss_release_buffer(&gss_status, &gss_w_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
failf(data, "Failed to unwrap GSSAPI encryption value into token.");
return CURLE_COULDNT_CONNECT;
}
gss_release_buffer(&gss_status, &gss_recv_token);
if(gss_w_token.length != 1) {
failf(data, "Invalid GSSAPI encryption response length (%d).",
gss_w_token.length);
gss_release_buffer(&gss_status, &gss_w_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
memcpy(socksreq,gss_w_token.value,gss_w_token.length);
gss_release_buffer(&gss_status, &gss_w_token);
}
else {
if(gss_recv_token.length != 1) {
failf(data, "Invalid GSSAPI encryption response length (%d).",
gss_recv_token.length);
gss_release_buffer(&gss_status, &gss_recv_token);
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_COULDNT_CONNECT;
}
memcpy(socksreq,gss_recv_token.value,gss_recv_token.length);
gss_release_buffer(&gss_status, &gss_recv_token);
}
infof(data, "SOCKS5 access with%s protection granted.\n",
(socksreq[0]==0)?"out gssapi data":
((socksreq[0]==1)?" gssapi integrity":" gssapi confidentiality"));
conn->socks5_gssapi_enctype = socksreq[0];
if(socksreq[0] == 0)
gss_delete_sec_context(&gss_status, &gss_context, NULL);
return CURLE_OK;
}
#endif

649
lib/socks_sspi.c Normal file
View File

@ -0,0 +1,649 @@
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2009, Markus Moeller, <markus_moeller@compuserve.com>
*
* 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"
#ifdef USE_WINDOWS_SSPI
#include <ntsecapi.h>
#include <string.h>
#ifdef NEED_MALLOC_H
#include <malloc.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "urldata.h"
#include "sendf.h"
#include "connect.h"
#include "timeval.h"
#include "socks.h"
/* The last #include file should be: */
#include "memdebug.h"
/*
* Helper sspi error functions.
*/
typedef long OM_uint32;
static int check_sspi_err(struct SessionHandle *data,
OM_uint32 major_status,
OM_uint32 minor_status,
const char* function)
{
char *txt;
if(major_status != SEC_E_OK &&
major_status != SEC_I_COMPLETE_AND_CONTINUE &&
major_status != SEC_I_COMPLETE_NEEDED &&
major_status != SEC_I_CONTINUE_NEEDED) {
failf(data, "SSPI error: %s failed: %d\n", function, major_status);
switch (major_status) {
case SEC_I_COMPLETE_AND_CONTINUE:
txt="SEC_I_COMPLETE_AND_CONTINUE";
break;
case SEC_I_COMPLETE_NEEDED:
txt="SEC_I_COMPLETE_NEEDED";
break;
case SEC_I_CONTINUE_NEEDED:
txt="SEC_I_CONTINUE_NEEDED";
break;
case SEC_I_INCOMPLETE_CREDENTIALS:
txt="SEC_I_INCOMPLETE_CREDENTIALS";
break;
case SEC_E_INSUFFICIENT_MEMORY:
txt="SEC_E_INSUFFICIENT_MEMORY";
break;
case SEC_E_INTERNAL_ERROR:
txt="SEC_E_INTERNAL_ERROR";
break;
case SEC_E_INVALID_HANDLE:
txt="SEC_E_INVALID_HANDLE";
break;
case SEC_E_INVALID_TOKEN:
txt="SEC_E_INVALID_TOKEN";
break;
case SEC_E_LOGON_DENIED:
txt="SEC_E_LOGON_DENIED";
break;
case SEC_E_NO_AUTHENTICATING_AUTHORITY:
txt="SEC_E_NO_AUTHENTICATING_AUTHORITY";
break;
case SEC_E_NO_CREDENTIALS:
txt="SEC_E_NO_CREDENTIALS";
break;
case SEC_E_TARGET_UNKNOWN:
txt="SEC_E_TARGET_UNKNOWN";
break;
case SEC_E_UNSUPPORTED_FUNCTION:
txt="SEC_E_UNSUPPORTED_FUNCTION";
break;
case SEC_E_WRONG_PRINCIPAL:
txt="SEC_E_WRONG_PRINCIPAL";
break;
default:
txt="Unknown error";
}
failf(data, "SSPI error: %s failed: %s\n", function, txt);
return(1);
}
return(0);
}
/* This is the SSPI-using version of this function */
CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex,
struct connectdata *conn)
{
struct SessionHandle *data = conn->data;
curl_socket_t sock = conn->sock[sockindex];
CURLcode code;
ssize_t actualread;
ssize_t written;
int result;
long timeout;
/* Needs GSSAPI authentication */
OM_uint32 sspi_major_status, sspi_minor_status=0;
OM_uint32 sspi_ret_flags=0;
int gss_enc;
SecBuffer sspi_send_token, sspi_recv_token, sspi_w_token[3];
SecBufferDesc input_desc, output_desc, wrap_desc;
SecPkgContext_Sizes sspi_sizes;
CredHandle cred_handle;
CtxtHandle sspi_context;
PCtxtHandle context_handle = NULL;
SecPkgCredentials_Names names;
TimeStamp expiry;
char *service_name=NULL;
u_short us_length;
ULONG qop;
unsigned char socksreq[4]; /* room for gssapi exchange header only */
char *service = data->set.str[STRING_SOCKS5_GSSAPI_SERVICE];
/* get timeout */
timeout = Curl_timeleft(conn, NULL, TRUE);
/* GSSAPI request looks like
* +----+------+-----+----------------+
* |VER | MTYP | LEN | TOKEN |
* +----+------+----------------------+
* | 1 | 1 | 2 | up to 2^16 - 1 |
* +----+------+-----+----------------+
*/
/* prepare service name */
if (strchr(service, '/')) {
service_name = malloc(strlen(service));
if(!service_name)
return CURLE_OUT_OF_MEMORY;
memcpy(service_name, service, strlen(service));
}
else {
service_name = malloc(strlen(service) + strlen(conn->proxy.name) + 2);
if(!service_name)
return CURLE_OUT_OF_MEMORY;
_snprintf(service_name,strlen(service) +strlen(conn->proxy.name)+2,"%s/%s",
service,conn->proxy.name);
}
input_desc.cBuffers = 1;
input_desc.pBuffers = &sspi_recv_token;
input_desc.ulVersion = SECBUFFER_VERSION;
sspi_recv_token.BufferType = SECBUFFER_TOKEN;
sspi_recv_token.cbBuffer = 0;
sspi_recv_token.pvBuffer = NULL;
output_desc.cBuffers = 1;
output_desc.pBuffers = &sspi_send_token;
output_desc.ulVersion = SECBUFFER_VERSION;
sspi_send_token.BufferType = SECBUFFER_TOKEN;
sspi_send_token.cbBuffer = 0;
sspi_send_token.pvBuffer = NULL;
wrap_desc.cBuffers = 3;
wrap_desc.pBuffers = sspi_w_token;
wrap_desc.ulVersion = SECBUFFER_VERSION;
cred_handle.dwLower = 0;
cred_handle.dwUpper = 0;
sspi_major_status = AcquireCredentialsHandle( NULL,
"Kerberos",
SECPKG_CRED_OUTBOUND,
NULL,
NULL,
NULL,
NULL,
&cred_handle,
&expiry);
if(check_sspi_err(data, sspi_major_status,sspi_minor_status,
"AcquireCredentialsHandle") ) {
failf(data, "Failed to acquire credentials.");
free(service_name);
service_name=NULL;
FreeCredentialsHandle(&cred_handle);
return CURLE_COULDNT_CONNECT;
}
/* As long as we need to keep sending some context info, and there's no */
/* errors, keep sending it... */
for(;;) {
sspi_major_status = InitializeSecurityContext( &cred_handle,
context_handle,
service_name,
ISC_REQ_MUTUAL_AUTH |
ISC_REQ_ALLOCATE_MEMORY |
ISC_REQ_CONFIDENTIALITY |
ISC_REQ_REPLAY_DETECT,
0,
SECURITY_NATIVE_DREP,
&input_desc,
0,
&sspi_context,
&output_desc,
&sspi_ret_flags,
&expiry);
if(sspi_recv_token.pvBuffer) {
FreeContextBuffer(sspi_recv_token.pvBuffer);
sspi_recv_token.pvBuffer = NULL;
sspi_recv_token.cbBuffer = 0;
}
if(check_sspi_err(data,sspi_major_status,sspi_minor_status,
"InitializeSecurityContext") ){
free(service_name);
service_name=NULL;
FreeCredentialsHandle(&cred_handle);
DeleteSecurityContext(&sspi_context);
FreeContextBuffer(sspi_recv_token.pvBuffer);
failf(data, "Failed to initialise security context.");
return CURLE_COULDNT_CONNECT;
}
if(sspi_send_token.cbBuffer != 0) {
socksreq[0] = 1; /* gssapi subnegotiation version */
socksreq[1] = 1; /* authentication message type */
us_length = htons((short)sspi_send_token.cbBuffer);
memcpy(socksreq+2, &us_length, sizeof(short));
code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
if((code != CURLE_OK) || (4 != written)) {
failf(data, "Failed to send SSPI authentication request.");
free(service_name);
service_name=NULL;
FreeContextBuffer(sspi_send_token.pvBuffer);
FreeContextBuffer(sspi_recv_token.pvBuffer);
FreeCredentialsHandle(&cred_handle);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
code = Curl_write_plain(conn, sock, (char *)sspi_send_token.pvBuffer,
sspi_send_token.cbBuffer, &written);
if((code != CURLE_OK) || (sspi_send_token.cbBuffer != written)) {
failf(data, "Failed to send SSPI authentication token.");
free(service_name);
service_name=NULL;
FreeContextBuffer(sspi_send_token.pvBuffer);
FreeContextBuffer(sspi_recv_token.pvBuffer);
FreeCredentialsHandle(&cred_handle);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
}
FreeContextBuffer(sspi_send_token.pvBuffer);
sspi_send_token.pvBuffer = NULL;
sspi_send_token.cbBuffer = 0;
FreeContextBuffer(sspi_recv_token.pvBuffer);
sspi_recv_token.pvBuffer = NULL;
sspi_recv_token.cbBuffer = 0;
if(sspi_major_status != SEC_I_CONTINUE_NEEDED) break;
/* analyse response */
/* GSSAPI response looks like
* +----+------+-----+----------------+
* |VER | MTYP | LEN | TOKEN |
* +----+------+----------------------+
* | 1 | 1 | 2 | up to 2^16 - 1 |
* +----+------+-----+----------------+
*/
result=Curl_blockread_all(conn, sock, (char *)socksreq, 4,
&actualread, timeout);
if(result != CURLE_OK || actualread != 4) {
failf(data, "Failed to receive SSPI authentication response.");
free(service_name);
service_name=NULL;
FreeCredentialsHandle(&cred_handle);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
/* ignore the first (VER) byte */
if(socksreq[1] == 255) { /* status / message type */
failf(data, "User was rejected by the SOCKS5 server (%d %d).",
socksreq[0], socksreq[1]);
free(service_name);
service_name=NULL;
FreeCredentialsHandle(&cred_handle);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
if(socksreq[1] != 1) { /* status / messgae type */
failf(data, "Invalid SSPI authentication response type (%d %d).",
socksreq[0], socksreq[1]);
free(service_name);
service_name=NULL;
FreeCredentialsHandle(&cred_handle);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
memcpy(&us_length, socksreq+2, sizeof(short));
us_length = ntohs(us_length);
sspi_recv_token.cbBuffer = us_length;
sspi_recv_token.pvBuffer = malloc(us_length);
if(!sspi_recv_token.pvBuffer) {
free(service_name);
service_name=NULL;
FreeCredentialsHandle(&cred_handle);
DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
result = Curl_blockread_all(conn, sock, (char *)sspi_recv_token.pvBuffer,
sspi_recv_token.cbBuffer,
&actualread, timeout);
if(result != CURLE_OK || actualread != us_length) {
failf(data, "Failed to receive SSPI authentication token.");
free(service_name);
service_name=NULL;
FreeContextBuffer(sspi_recv_token.pvBuffer);
FreeCredentialsHandle(&cred_handle);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
context_handle = &sspi_context;
}
free(service_name);
service_name=NULL;
/* Everything is good so far, user was authenticated! */
sspi_major_status =
QueryCredentialsAttributes(&cred_handle, SECPKG_CRED_ATTR_NAMES, &names);
FreeCredentialsHandle(&cred_handle);
if(check_sspi_err(data,sspi_major_status,sspi_minor_status,
"QueryCredentialAttributes") ){
DeleteSecurityContext(&sspi_context);
FreeContextBuffer(names.sUserName);
failf(data, "Failed to determine user name.");
return CURLE_COULDNT_CONNECT;
}
infof(data, "SOCKS5 server authencticated user %s with gssapi.\n",
names.sUserName);
FreeContextBuffer(names.sUserName);
/* Do encryption */
socksreq[0] = 1; /* gssapi subnegotiation version */
socksreq[1] = 2; /* encryption message type */
gss_enc = 0; /* no data protection */
/* do confidentiality protection if supported */
if(sspi_ret_flags & ISC_REQ_CONFIDENTIALITY)
gss_enc = 2;
/* else do integrity protection */
else if(sspi_ret_flags & ISC_REQ_INTEGRITY)
gss_enc = 1;
infof(data, "SOCKS5 server supports gssapi %s data protection.\n",
(gss_enc==0)?"no":((gss_enc==1)?"integrity":"confidentiality") );
/* force to no data protection, avoid encryption/decryption for now */
gss_enc = 0;
/*
* Sending the encryption type in clear seems wrong. It should be
* protected with gss_seal()/gss_wrap(). See RFC1961 extract below
* The NEC reference implementations on which this is based is
* therefore at fault
*
* +------+------+------+.......................+
* + ver | mtyp | len | token |
* +------+------+------+.......................+
* + 0x01 | 0x02 | 0x02 | up to 2^16 - 1 octets |
* +------+------+------+.......................+
*
* Where:
*
* - "ver" is the protocol version number, here 1 to represent the
* first version of the SOCKS/GSS-API protocol
*
* - "mtyp" is the message type, here 2 to represent a protection
* -level negotiation message
*
* - "len" is the length of the "token" field in octets
*
* - "token" is the GSS-API encapsulated protection level
*
* The token is produced by encapsulating an octet containing the
* required protection level using gss_seal()/gss_wrap() with conf_req
* set to FALSE. The token is verified using gss_unseal()/
* gss_unwrap().
*
*/
if(data->set.socks5_gssapi_nec) {
us_length = htons((short)1);
memcpy(socksreq+2, &us_length, sizeof(short));
}
else {
sspi_major_status = QueryContextAttributes( &sspi_context,
SECPKG_ATTR_SIZES,
&sspi_sizes);
if(check_sspi_err(data,sspi_major_status,sspi_minor_status,
"QueryContextAttributes")) {
DeleteSecurityContext(&sspi_context);
failf(data, "Failed to query security context attributes.");
return CURLE_COULDNT_CONNECT;
}
sspi_w_token[0].cbBuffer = sspi_sizes.cbSecurityTrailer;
sspi_w_token[0].BufferType = SECBUFFER_TOKEN;
sspi_w_token[0].pvBuffer = malloc(sspi_sizes.cbSecurityTrailer);
if(!sspi_w_token[0].pvBuffer) {
DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
sspi_w_token[1].cbBuffer = 1;
sspi_w_token[1].pvBuffer = malloc(1);
if(!sspi_w_token[1].pvBuffer){
FreeContextBuffer(sspi_w_token[0].pvBuffer);
DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
memcpy(sspi_w_token[1].pvBuffer,&gss_enc,1);
sspi_w_token[2].BufferType = SECBUFFER_PADDING;
sspi_w_token[2].cbBuffer = sspi_sizes.cbBlockSize;
sspi_w_token[2].pvBuffer = malloc(sspi_sizes.cbBlockSize);
if(!sspi_w_token[2].pvBuffer) {
FreeContextBuffer(sspi_w_token[0].pvBuffer);
FreeContextBuffer(sspi_w_token[1].pvBuffer);
DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
sspi_major_status = EncryptMessage( &sspi_context,
KERB_WRAP_NO_ENCRYPT,
&wrap_desc,
0);
if(check_sspi_err(data,sspi_major_status,sspi_minor_status,
"EncryptMessage") ) {
FreeContextBuffer(sspi_w_token[0].pvBuffer);
FreeContextBuffer(sspi_w_token[1].pvBuffer);
FreeContextBuffer(sspi_w_token[2].pvBuffer);
DeleteSecurityContext(&sspi_context);
failf(data, "Failed to query security context attributes.");
return CURLE_COULDNT_CONNECT;
}
sspi_send_token.cbBuffer = sspi_w_token[0].cbBuffer
+ sspi_w_token[1].cbBuffer
+ sspi_w_token[2].cbBuffer;
sspi_send_token.pvBuffer = malloc(sspi_send_token.cbBuffer);
if(!sspi_send_token.pvBuffer) {
FreeContextBuffer(sspi_w_token[0].pvBuffer);
FreeContextBuffer(sspi_w_token[1].pvBuffer);
FreeContextBuffer(sspi_w_token[2].pvBuffer);
DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
memcpy(sspi_send_token.pvBuffer, sspi_w_token[0].pvBuffer,
sspi_w_token[0].cbBuffer);
memcpy((PUCHAR) sspi_send_token.pvBuffer +(int)sspi_w_token[0].cbBuffer,
sspi_w_token[1].pvBuffer, sspi_w_token[1].cbBuffer);
memcpy((PUCHAR) sspi_send_token.pvBuffer
+sspi_w_token[0].cbBuffer
+sspi_w_token[1].cbBuffer,
sspi_w_token[2].pvBuffer, sspi_w_token[2].cbBuffer);
FreeContextBuffer(sspi_w_token[0].pvBuffer);
sspi_w_token[0].pvBuffer = NULL;
sspi_w_token[0].cbBuffer = 0;
FreeContextBuffer(sspi_w_token[1].pvBuffer);
sspi_w_token[1].pvBuffer = NULL;
sspi_w_token[1].cbBuffer = 0;
FreeContextBuffer(sspi_w_token[2].pvBuffer);
sspi_w_token[2].pvBuffer = NULL;
sspi_w_token[2].cbBuffer = 0;
us_length = htons((short)sspi_send_token.cbBuffer);
memcpy(socksreq+2,&us_length,sizeof(short));
}
code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
if((code != CURLE_OK) || (4 != written)) {
failf(data, "Failed to send SSPI encryption request.");
FreeContextBuffer(sspi_send_token.pvBuffer);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
if(data->set.socks5_gssapi_nec) {
memcpy(socksreq,&gss_enc,1);
code = Curl_write_plain(conn, sock, (char *)socksreq, 1, &written);
if((code != CURLE_OK) || (1 != written)) {
failf(data, "Failed to send SSPI encryption type.");
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
} else {
code = Curl_write_plain(conn, sock, (char *)sspi_send_token.pvBuffer,
sspi_send_token.cbBuffer, &written);
if((code != CURLE_OK) || (sspi_send_token.cbBuffer != written)) {
failf(data, "Failed to send SSPI encryption type.");
FreeContextBuffer(sspi_send_token.pvBuffer);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
FreeContextBuffer(sspi_send_token.pvBuffer);
}
result=Curl_blockread_all(conn, sock, (char *)socksreq, 4,
&actualread, timeout);
if(result != CURLE_OK || actualread != 4) {
failf(data, "Failed to receive SSPI encryption response.");
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
/* ignore the first (VER) byte */
if(socksreq[1] == 255) { /* status / message type */
failf(data, "User was rejected by the SOCKS5 server (%d %d).",
socksreq[0], socksreq[1]);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
if(socksreq[1] != 2) { /* status / message type */
failf(data, "Invalid SSPI encryption response type (%d %d).",
socksreq[0], socksreq[1]);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
memcpy(&us_length, socksreq+2, sizeof(short));
us_length = ntohs(us_length);
sspi_w_token[0].cbBuffer = us_length;
sspi_w_token[0].pvBuffer = malloc(us_length);
if(!sspi_w_token[0].pvBuffer) {
DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
result=Curl_blockread_all(conn, sock, (char *)sspi_w_token[0].pvBuffer,
sspi_w_token[0].cbBuffer,
&actualread, timeout);
if(result != CURLE_OK || actualread != us_length) {
failf(data, "Failed to receive SSPI encryption type.");
FreeContextBuffer(sspi_w_token[0].pvBuffer);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
if(!data->set.socks5_gssapi_nec) {
wrap_desc.cBuffers = 2;
sspi_w_token[0].BufferType = SECBUFFER_STREAM;
sspi_w_token[1].BufferType = SECBUFFER_DATA;
sspi_w_token[1].cbBuffer = 0;
sspi_w_token[1].pvBuffer = NULL;
sspi_major_status = DecryptMessage(&sspi_context, &wrap_desc, 0, &qop);
if(check_sspi_err(data,sspi_major_status,sspi_minor_status,
"DecryptMessage")) {
FreeContextBuffer(sspi_w_token[0].pvBuffer);
FreeContextBuffer(sspi_w_token[1].pvBuffer);
DeleteSecurityContext(&sspi_context);
failf(data, "Failed to query security context attributes.");
return CURLE_COULDNT_CONNECT;
}
if(sspi_w_token[1].cbBuffer != 1) {
failf(data, "Invalid SSPI encryption response length (%d).",
sspi_w_token[1].cbBuffer);
FreeContextBuffer(sspi_w_token[0].pvBuffer);
FreeContextBuffer(sspi_w_token[1].pvBuffer);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
memcpy(socksreq,sspi_w_token[1].pvBuffer,sspi_w_token[1].cbBuffer);
FreeContextBuffer(sspi_w_token[0].pvBuffer);
FreeContextBuffer(sspi_w_token[1].pvBuffer);
} else {
if(sspi_w_token[0].cbBuffer != 1) {
failf(data, "Invalid SSPI encryption response length (%d).",
sspi_w_token[0].cbBuffer);
FreeContextBuffer(sspi_w_token[0].pvBuffer);
DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
memcpy(socksreq,sspi_w_token[0].pvBuffer,sspi_w_token[0].cbBuffer);
FreeContextBuffer(sspi_w_token[0].pvBuffer);
}
infof(data, "SOCKS5 access with%s protection granted.\n",
(socksreq[0]==0)?"out gssapi data":
((socksreq[0]==1)?" gssapi integrity":" gssapi confidentiality"));
/* For later use if encryption is required
conn->socks5_gssapi_enctype = socksreq[0];
if (socksreq[0] != 0)
conn->socks5_sspi_context = sspi_context;
else {
DeleteSecurityContext(&sspi_context);
conn->socks5_sspi_context = sspi_context;
}
*/
return CURLE_OK;
}
#endif

31
lib/url.c
View File

@ -698,6 +698,20 @@ CURLcode Curl_init_userdefined(struct UserDefined *set)
set->new_file_perms = 0644; /* Default permissions */
set->new_directory_perms = 0755; /* Default permissions */
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
/*
* disallow unprotected protection negotiation NEC reference implementation
* seem not to follow rfc1961 section 4.3/4.4
*/
set->socks5_gssapi_nec = FALSE;
/* set default gssapi service name */
res = setstropt(&set->str[STRING_SOCKS5_GSSAPI_SERVICE],
(char *) CURL_DEFAULT_SOCKS5_GSSAPI_SERVICE);
if (res != CURLE_OK)
return res;
#endif
/* This is our preferred CA cert bundle/path since install time */
#if defined(CURL_CA_BUNDLE)
res = setstropt(&set->str[STRING_SSL_CAFILE], (char *) CURL_CA_BUNDLE);
@ -1463,6 +1477,23 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option,
break;
#endif
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
case CURLOPT_SOCKS5_GSSAPI_SERVICE:
/*
* Set gssapi service name
*/
result = setstropt(&data->set.str[STRING_SOCKS5_GSSAPI_SERVICE],
va_arg(param, char *));
break;
case CURLOPT_SOCKS5_GSSAPI_NEC:
/*
* set flag for nec socks5 support
*/
data->set.socks5_gssapi_nec = (bool)(0 != va_arg(param, long));
break;
#endif
case CURLOPT_WRITEHEADER:
/*
* Custom pointer to pass the header write callback function

1
lib/url.h
View File

@ -84,5 +84,6 @@ void Curl_close_connections(struct SessionHandle *data);
void Curl_reset_reqproto(struct connectdata *conn);
#define CURL_DEFAULT_PROXY_PORT 1080 /* default proxy port unless specified */
#define CURL_DEFAULT_SOCKS5_GSSAPI_SERVICE "rcmd" /* default socks5 gssapi service */
#endif

9
lib/urldata.h
View File

@ -1051,6 +1051,9 @@ struct connectdata {
} proto;
int cselect_bits; /* bitmask of socket events */
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
int socks5_gssapi_enctype;
#endif
};
/* The end of connectdata. */
@ -1366,6 +1369,9 @@ enum dupstring {
STRING_PROXYPASSWORD, /* Proxy <password>, if used */
STRING_NOPROXY, /* List of hosts which should not use the proxy, if
used */
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
STRING_SOCKS5_GSSAPI_SERVICE, /* GSSAPI service name */
#endif
/* -- end of strings -- */
STRING_LAST /* not used, just an end-of-list marker */
@ -1524,6 +1530,9 @@ struct UserDefined {
via an HTTP proxy */
char *str[STRING_LAST]; /* array of strings, pointing to allocated memory */
unsigned int scope; /* address scope for IPv6 */
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
long socks5_gssapi_nec; /* flag to support nec socks5 server */
#endif
};
struct Names {

4
src/Makefile.vc6
View File

@ -221,8 +221,8 @@ LFLAGS = $(LFLAGS) $(SSL_IMP_LFLAGS) $(ZLIB_LFLAGS)
!ENDIF
LINKLIBS = $(LINKLIBS) wsock32.lib wldap32.lib
LINKLIBS_DEBUG = $(LINKLIBS_DEBUG) wsock32.lib wldap32.lib
LINKLIBS = $(LINKLIBS) wsock32.lib wldap32.lib secur32.lib
LINKLIBS_DEBUG = $(LINKLIBS_DEBUG) wsock32.lib wldap32.lib secur32.lib
all : release

34
src/main.c
View File

@ -536,6 +536,10 @@ struct Configurable {
char *socksproxy; /* set to server string */
int socksver; /* set to CURLPROXY_SOCKS* define */
char *socks5_gssapi_service; /* set service name for gssapi principal
* default rcmd */
int socks5_gssapi_nec ; /* The NEC reference server does not protect
* the encryption type exchange */
bool tcp_nodelay;
long req_retry; /* number of retries */
@ -807,6 +811,10 @@ static void help(void)
" --socks4a <host[:port]> SOCKS4a proxy on given host + port",
" --socks5 <host[:port]> SOCKS5 proxy on given host + port",
" --socks5-hostname <host[:port]> SOCKS5 proxy, pass host name to proxy",
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
" --socks5-gssapi-service <name> SOCKS5 proxy service name for gssapi",
" --socks5-gssapi-nec Compatibility with NEC SOCKS5 server",
#endif
" -Y/--speed-limit Stop transfer if below speed-limit for 'speed-time' secs",
" -y/--speed-time Time needed to trig speed-limit abort. Defaults to 30",
" -2/--sslv2 Use SSLv2 (SSL)",
@ -1669,6 +1677,10 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
{"$3", "keepalive-time", TRUE},
{"$4", "post302", FALSE},
{"$5", "noproxy", TRUE},
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
{"$6", "socks5-gssapi-service", TRUE},
{"$7", "socks5-gssapi-nec", FALSE},
#endif
{"0", "http1.0", FALSE},
{"1", "tlsv1", FALSE},
@ -2182,6 +2194,14 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
/* This specifies the noproxy list */
GetStr(&config->noproxy, nextarg);
break;
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
case '6': /* --socks5-gssapi-service */
GetStr(&config->socks5_gssapi_service, nextarg);
break;
case '7': /* --socks5-gssapi-nec*/
config->socks5_gssapi_nec = TRUE;
break;
#endif
}
break;
case '#': /* --progress-bar */
@ -3700,6 +3720,10 @@ static void free_config_fields(struct Configurable *config)
free(config->referer);
if (config->hostpubmd5)
free(config->hostpubmd5);
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
if(config->socks5_gssapi_service)
free(config->socks5_gssapi_service);
#endif
curl_slist_free_all(config->quote); /* checks for config->quote == NULL */
curl_slist_free_all(config->prequote);
@ -4768,6 +4792,16 @@ operate(struct Configurable *config, int argc, argv_item_t argv[])
my_setopt(curl, CURLOPT_PROXYTYPE, config->socksver);
}
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
/* new in curl 7.19.4 */
if(config->socks5_gssapi_service)
my_setopt(curl, CURLOPT_SOCKS5_GSSAPI_SERVICE,
config->socks5_gssapi_service);
/* new in curl 7.19.4 */
if(config->socks5_gssapi_nec)
my_setopt(curl, CURLOPT_SOCKS5_GSSAPI_NEC, config->socks5_gssapi_nec);
#endif
/* curl 7.13.0 */
my_setopt(curl, CURLOPT_FTP_ACCOUNT, config->ftp_account);