diff options
Diffstat (limited to 'lib/socks_gssapi.c')
| -rw-r--r-- | lib/socks_gssapi.c | 533 |
1 files changed, 0 insertions, 533 deletions
diff --git a/lib/socks_gssapi.c b/lib/socks_gssapi.c deleted file mode 100644 index 2bd3d4508..000000000 --- a/lib/socks_gssapi.c +++ /dev/null @@ -1,533 +0,0 @@ -/*************************************************************************** - * _ _ ____ _ - * Project ___| | | | _ \| | - * / __| | | | |_) | | - * | (__| |_| | _ <| |___ - * \___|\___/|_| \_\_____| - * - * Copyright (C) 2009, 2011, Markus Moeller, <markus_moeller@compuserve.com> - * Copyright (C) 2012, 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" - -#ifndef CURL_DISABLE_PROXY - -#ifdef HAVE_GSSAPI -#ifdef HAVE_OLD_GSSMIT -#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name -#define NCOMPAT 1 -#endif -#ifndef gss_nt_service_name -#define gss_nt_service_name GSS_C_NT_HOSTBASED_SERVICE -#endif - -#include "curl_gssapi.h" -#include "curl_urldata.h" -#include "curl_sendf.h" -#include "curl_connect.h" -#include "curl_timeval.h" -#include "curl_socks.h" -#include "curl_warnless.h" - -#define _MPRINTF_REPLACE /* use our functions only */ -#include <curl/mprintf.h> - -#include "curl_memory.h" -/* The last #include file should be: */ -#include "curl_memdebug.h" - -static gss_ctx_id_t gss_context = GSS_C_NO_CONTEXT; - -/* - * 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); - gss_release_buffer(&min_stat, &status_string); - break; - } - gss_release_buffer(&min_stat, &status_string); - } - failf(data, "GSSAPI error: %s failed:\n%s", 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; - 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; - unsigned 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]; - - /* 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 = Curl_gss_init_sec_context(data, - &gss_minor_status, - &gss_context, - server, - NULL, - gss_token, - &gss_send_token, - &gss_ret_flags); - - 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); - 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); - - 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); - 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); - - 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 - -#endif /* CURL_DISABLE_PROXY */ |