Annotation of embedaddon/curl/lib/socks_gssapi.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 2012 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
        !             9:  * Copyright (C) 2009, Markus Moeller, <markus_moeller@compuserve.com>
        !            10:  *
        !            11:  * This software is licensed as described in the file COPYING, which
        !            12:  * you should have received as part of this distribution. The terms
        !            13:  * are also available at https://curl.haxx.se/docs/copyright.html.
        !            14:  *
        !            15:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
        !            16:  * copies of the Software, and permit persons to whom the Software is
        !            17:  * furnished to do so, under the terms of the COPYING file.
        !            18:  *
        !            19:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
        !            20:  * KIND, either express or implied.
        !            21:  *
        !            22:  ***************************************************************************/
        !            23: 
        !            24: #include "curl_setup.h"
        !            25: 
        !            26: #if defined(HAVE_GSSAPI) && !defined(CURL_DISABLE_PROXY)
        !            27: 
        !            28: #include "curl_gssapi.h"
        !            29: #include "urldata.h"
        !            30: #include "sendf.h"
        !            31: #include "connect.h"
        !            32: #include "timeval.h"
        !            33: #include "socks.h"
        !            34: #include "warnless.h"
        !            35: 
        !            36: /* The last 3 #include files should be in this order */
        !            37: #include "curl_printf.h"
        !            38: #include "curl_memory.h"
        !            39: #include "memdebug.h"
        !            40: 
        !            41: static gss_ctx_id_t gss_context = GSS_C_NO_CONTEXT;
        !            42: 
        !            43: /*
        !            44:  * Helper GSS-API error functions.
        !            45:  */
        !            46: static int check_gss_err(struct Curl_easy *data,
        !            47:                          OM_uint32 major_status,
        !            48:                          OM_uint32 minor_status,
        !            49:                          const char *function)
        !            50: {
        !            51:   if(GSS_ERROR(major_status)) {
        !            52:     OM_uint32 maj_stat, min_stat;
        !            53:     OM_uint32 msg_ctx = 0;
        !            54:     gss_buffer_desc status_string;
        !            55:     char buf[1024];
        !            56:     size_t len;
        !            57: 
        !            58:     len = 0;
        !            59:     msg_ctx = 0;
        !            60:     while(!msg_ctx) {
        !            61:       /* convert major status code (GSS-API error) to text */
        !            62:       maj_stat = gss_display_status(&min_stat, major_status,
        !            63:                                     GSS_C_GSS_CODE,
        !            64:                                     GSS_C_NULL_OID,
        !            65:                                     &msg_ctx, &status_string);
        !            66:       if(maj_stat == GSS_S_COMPLETE) {
        !            67:         if(sizeof(buf) > len + status_string.length + 1) {
        !            68:           strcpy(buf + len, (char *) status_string.value);
        !            69:           len += status_string.length;
        !            70:         }
        !            71:         gss_release_buffer(&min_stat, &status_string);
        !            72:         break;
        !            73:       }
        !            74:       gss_release_buffer(&min_stat, &status_string);
        !            75:     }
        !            76:     if(sizeof(buf) > len + 3) {
        !            77:       strcpy(buf + len, ".\n");
        !            78:       len += 2;
        !            79:     }
        !            80:     msg_ctx = 0;
        !            81:     while(!msg_ctx) {
        !            82:       /* convert minor status code (underlying routine error) to text */
        !            83:       maj_stat = gss_display_status(&min_stat, minor_status,
        !            84:                                     GSS_C_MECH_CODE,
        !            85:                                     GSS_C_NULL_OID,
        !            86:                                     &msg_ctx, &status_string);
        !            87:       if(maj_stat == GSS_S_COMPLETE) {
        !            88:         if(sizeof(buf) > len + status_string.length)
        !            89:           strcpy(buf + len, (char *) status_string.value);
        !            90:         gss_release_buffer(&min_stat, &status_string);
        !            91:         break;
        !            92:       }
        !            93:       gss_release_buffer(&min_stat, &status_string);
        !            94:     }
        !            95:     failf(data, "GSS-API error: %s failed:\n%s", function, buf);
        !            96:     return 1;
        !            97:   }
        !            98: 
        !            99:   return 0;
        !           100: }
        !           101: 
        !           102: CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex,
        !           103:                                       struct connectdata *conn)
        !           104: {
        !           105:   struct Curl_easy *data = conn->data;
        !           106:   curl_socket_t sock = conn->sock[sockindex];
        !           107:   CURLcode code;
        !           108:   ssize_t actualread;
        !           109:   ssize_t written;
        !           110:   int result;
        !           111:   OM_uint32 gss_major_status, gss_minor_status, gss_status;
        !           112:   OM_uint32 gss_ret_flags;
        !           113:   int gss_conf_state, gss_enc;
        !           114:   gss_buffer_desc  service = GSS_C_EMPTY_BUFFER;
        !           115:   gss_buffer_desc  gss_send_token = GSS_C_EMPTY_BUFFER;
        !           116:   gss_buffer_desc  gss_recv_token = GSS_C_EMPTY_BUFFER;
        !           117:   gss_buffer_desc  gss_w_token = GSS_C_EMPTY_BUFFER;
        !           118:   gss_buffer_desc* gss_token = GSS_C_NO_BUFFER;
        !           119:   gss_name_t       server = GSS_C_NO_NAME;
        !           120:   gss_name_t       gss_client_name = GSS_C_NO_NAME;
        !           121:   unsigned short   us_length;
        !           122:   char             *user = NULL;
        !           123:   unsigned char socksreq[4]; /* room for GSS-API exchange header only */
        !           124:   const char *serviceptr = data->set.str[STRING_PROXY_SERVICE_NAME] ?
        !           125:                            data->set.str[STRING_PROXY_SERVICE_NAME] : "rcmd";
        !           126:   const size_t serviceptr_length = strlen(serviceptr);
        !           127: 
        !           128:   /*   GSS-API request looks like
        !           129:    * +----+------+-----+----------------+
        !           130:    * |VER | MTYP | LEN |     TOKEN      |
        !           131:    * +----+------+----------------------+
        !           132:    * | 1  |  1   |  2  | up to 2^16 - 1 |
        !           133:    * +----+------+-----+----------------+
        !           134:    */
        !           135: 
        !           136:   /* prepare service name */
        !           137:   if(strchr(serviceptr, '/')) {
        !           138:     service.length = serviceptr_length;
        !           139:     service.value = malloc(service.length);
        !           140:     if(!service.value)
        !           141:       return CURLE_OUT_OF_MEMORY;
        !           142:     memcpy(service.value, serviceptr, service.length);
        !           143: 
        !           144:     gss_major_status = gss_import_name(&gss_minor_status, &service,
        !           145:                                        (gss_OID) GSS_C_NULL_OID, &server);
        !           146:   }
        !           147:   else {
        !           148:     service.value = malloc(serviceptr_length +
        !           149:                            strlen(conn->socks_proxy.host.name) + 2);
        !           150:     if(!service.value)
        !           151:       return CURLE_OUT_OF_MEMORY;
        !           152:     service.length = serviceptr_length +
        !           153:       strlen(conn->socks_proxy.host.name) + 1;
        !           154:     msnprintf(service.value, service.length + 1, "%s@%s",
        !           155:               serviceptr, conn->socks_proxy.host.name);
        !           156: 
        !           157:     gss_major_status = gss_import_name(&gss_minor_status, &service,
        !           158:                                        GSS_C_NT_HOSTBASED_SERVICE, &server);
        !           159:   }
        !           160: 
        !           161:   gss_release_buffer(&gss_status, &service); /* clear allocated memory */
        !           162: 
        !           163:   if(check_gss_err(data, gss_major_status,
        !           164:                    gss_minor_status, "gss_import_name()")) {
        !           165:     failf(data, "Failed to create service name.");
        !           166:     gss_release_name(&gss_status, &server);
        !           167:     return CURLE_COULDNT_CONNECT;
        !           168:   }
        !           169: 
        !           170:   (void)curlx_nonblock(sock, FALSE);
        !           171: 
        !           172:   /* As long as we need to keep sending some context info, and there's no  */
        !           173:   /* errors, keep sending it...                                            */
        !           174:   for(;;) {
        !           175:     gss_major_status = Curl_gss_init_sec_context(data,
        !           176:                                                  &gss_minor_status,
        !           177:                                                  &gss_context,
        !           178:                                                  server,
        !           179:                                                  &Curl_krb5_mech_oid,
        !           180:                                                  NULL,
        !           181:                                                  gss_token,
        !           182:                                                  &gss_send_token,
        !           183:                                                  TRUE,
        !           184:                                                  &gss_ret_flags);
        !           185: 
        !           186:     if(gss_token != GSS_C_NO_BUFFER)
        !           187:       gss_release_buffer(&gss_status, &gss_recv_token);
        !           188:     if(check_gss_err(data, gss_major_status,
        !           189:                      gss_minor_status, "gss_init_sec_context")) {
        !           190:       gss_release_name(&gss_status, &server);
        !           191:       gss_release_buffer(&gss_status, &gss_recv_token);
        !           192:       gss_release_buffer(&gss_status, &gss_send_token);
        !           193:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           194:       failf(data, "Failed to initial GSS-API token.");
        !           195:       return CURLE_COULDNT_CONNECT;
        !           196:     }
        !           197: 
        !           198:     if(gss_send_token.length != 0) {
        !           199:       socksreq[0] = 1;    /* GSS-API subnegotiation version */
        !           200:       socksreq[1] = 1;    /* authentication message type */
        !           201:       us_length = htons((short)gss_send_token.length);
        !           202:       memcpy(socksreq + 2, &us_length, sizeof(short));
        !           203: 
        !           204:       code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
        !           205:       if(code || (4 != written)) {
        !           206:         failf(data, "Failed to send GSS-API authentication request.");
        !           207:         gss_release_name(&gss_status, &server);
        !           208:         gss_release_buffer(&gss_status, &gss_recv_token);
        !           209:         gss_release_buffer(&gss_status, &gss_send_token);
        !           210:         gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           211:         return CURLE_COULDNT_CONNECT;
        !           212:       }
        !           213: 
        !           214:       code = Curl_write_plain(conn, sock, (char *)gss_send_token.value,
        !           215:                               gss_send_token.length, &written);
        !           216: 
        !           217:       if(code || ((ssize_t)gss_send_token.length != written)) {
        !           218:         failf(data, "Failed to send GSS-API authentication token.");
        !           219:         gss_release_name(&gss_status, &server);
        !           220:         gss_release_buffer(&gss_status, &gss_recv_token);
        !           221:         gss_release_buffer(&gss_status, &gss_send_token);
        !           222:         gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           223:         return CURLE_COULDNT_CONNECT;
        !           224:       }
        !           225: 
        !           226:     }
        !           227: 
        !           228:     gss_release_buffer(&gss_status, &gss_send_token);
        !           229:     gss_release_buffer(&gss_status, &gss_recv_token);
        !           230:     if(gss_major_status != GSS_S_CONTINUE_NEEDED)
        !           231:       break;
        !           232: 
        !           233:     /* analyse response */
        !           234: 
        !           235:     /*   GSS-API response looks like
        !           236:      * +----+------+-----+----------------+
        !           237:      * |VER | MTYP | LEN |     TOKEN      |
        !           238:      * +----+------+----------------------+
        !           239:      * | 1  |  1   |  2  | up to 2^16 - 1 |
        !           240:      * +----+------+-----+----------------+
        !           241:      */
        !           242: 
        !           243:     result = Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread);
        !           244:     if(result || (actualread != 4)) {
        !           245:       failf(data, "Failed to receive GSS-API authentication response.");
        !           246:       gss_release_name(&gss_status, &server);
        !           247:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           248:       return CURLE_COULDNT_CONNECT;
        !           249:     }
        !           250: 
        !           251:     /* ignore the first (VER) byte */
        !           252:     if(socksreq[1] == 255) { /* status / message type */
        !           253:       failf(data, "User was rejected by the SOCKS5 server (%d %d).",
        !           254:             socksreq[0], socksreq[1]);
        !           255:       gss_release_name(&gss_status, &server);
        !           256:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           257:       return CURLE_COULDNT_CONNECT;
        !           258:     }
        !           259: 
        !           260:     if(socksreq[1] != 1) { /* status / messgae type */
        !           261:       failf(data, "Invalid GSS-API authentication response type (%d %d).",
        !           262:             socksreq[0], socksreq[1]);
        !           263:       gss_release_name(&gss_status, &server);
        !           264:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           265:       return CURLE_COULDNT_CONNECT;
        !           266:     }
        !           267: 
        !           268:     memcpy(&us_length, socksreq + 2, sizeof(short));
        !           269:     us_length = ntohs(us_length);
        !           270: 
        !           271:     gss_recv_token.length = us_length;
        !           272:     gss_recv_token.value = malloc(us_length);
        !           273:     if(!gss_recv_token.value) {
        !           274:       failf(data,
        !           275:             "Could not allocate memory for GSS-API authentication "
        !           276:             "response token.");
        !           277:       gss_release_name(&gss_status, &server);
        !           278:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           279:       return CURLE_OUT_OF_MEMORY;
        !           280:     }
        !           281: 
        !           282:     result = Curl_blockread_all(conn, sock, (char *)gss_recv_token.value,
        !           283:                                 gss_recv_token.length, &actualread);
        !           284: 
        !           285:     if(result || (actualread != us_length)) {
        !           286:       failf(data, "Failed to receive GSS-API authentication token.");
        !           287:       gss_release_name(&gss_status, &server);
        !           288:       gss_release_buffer(&gss_status, &gss_recv_token);
        !           289:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           290:       return CURLE_COULDNT_CONNECT;
        !           291:     }
        !           292: 
        !           293:     gss_token = &gss_recv_token;
        !           294:   }
        !           295: 
        !           296:   gss_release_name(&gss_status, &server);
        !           297: 
        !           298:   /* Everything is good so far, user was authenticated! */
        !           299:   gss_major_status = gss_inquire_context(&gss_minor_status, gss_context,
        !           300:                                          &gss_client_name, NULL, NULL, NULL,
        !           301:                                          NULL, NULL, NULL);
        !           302:   if(check_gss_err(data, gss_major_status,
        !           303:                    gss_minor_status, "gss_inquire_context")) {
        !           304:     gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           305:     gss_release_name(&gss_status, &gss_client_name);
        !           306:     failf(data, "Failed to determine user name.");
        !           307:     return CURLE_COULDNT_CONNECT;
        !           308:   }
        !           309:   gss_major_status = gss_display_name(&gss_minor_status, gss_client_name,
        !           310:                                       &gss_send_token, NULL);
        !           311:   if(check_gss_err(data, gss_major_status,
        !           312:                    gss_minor_status, "gss_display_name")) {
        !           313:     gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           314:     gss_release_name(&gss_status, &gss_client_name);
        !           315:     gss_release_buffer(&gss_status, &gss_send_token);
        !           316:     failf(data, "Failed to determine user name.");
        !           317:     return CURLE_COULDNT_CONNECT;
        !           318:   }
        !           319:   user = malloc(gss_send_token.length + 1);
        !           320:   if(!user) {
        !           321:     gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           322:     gss_release_name(&gss_status, &gss_client_name);
        !           323:     gss_release_buffer(&gss_status, &gss_send_token);
        !           324:     return CURLE_OUT_OF_MEMORY;
        !           325:   }
        !           326: 
        !           327:   memcpy(user, gss_send_token.value, gss_send_token.length);
        !           328:   user[gss_send_token.length] = '\0';
        !           329:   gss_release_name(&gss_status, &gss_client_name);
        !           330:   gss_release_buffer(&gss_status, &gss_send_token);
        !           331:   infof(data, "SOCKS5 server authencticated user %s with GSS-API.\n",user);
        !           332:   free(user);
        !           333:   user = NULL;
        !           334: 
        !           335:   /* Do encryption */
        !           336:   socksreq[0] = 1;    /* GSS-API subnegotiation version */
        !           337:   socksreq[1] = 2;    /* encryption message type */
        !           338: 
        !           339:   gss_enc = 0; /* no data protection */
        !           340:   /* do confidentiality protection if supported */
        !           341:   if(gss_ret_flags & GSS_C_CONF_FLAG)
        !           342:     gss_enc = 2;
        !           343:   /* else do integrity protection */
        !           344:   else if(gss_ret_flags & GSS_C_INTEG_FLAG)
        !           345:     gss_enc = 1;
        !           346: 
        !           347:   infof(data, "SOCKS5 server supports GSS-API %s data protection.\n",
        !           348:         (gss_enc == 0)?"no":((gss_enc==1)?"integrity":"confidentiality"));
        !           349:   /* force for the moment to no data protection */
        !           350:   gss_enc = 0;
        !           351:   /*
        !           352:    * Sending the encryption type in clear seems wrong. It should be
        !           353:    * protected with gss_seal()/gss_wrap(). See RFC1961 extract below
        !           354:    * The NEC reference implementations on which this is based is
        !           355:    * therefore at fault
        !           356:    *
        !           357:    *  +------+------+------+.......................+
        !           358:    *  + ver  | mtyp | len  |   token               |
        !           359:    *  +------+------+------+.......................+
        !           360:    *  + 0x01 | 0x02 | 0x02 | up to 2^16 - 1 octets |
        !           361:    *  +------+------+------+.......................+
        !           362:    *
        !           363:    *   Where:
        !           364:    *
        !           365:    *  - "ver" is the protocol version number, here 1 to represent the
        !           366:    *    first version of the SOCKS/GSS-API protocol
        !           367:    *
        !           368:    *  - "mtyp" is the message type, here 2 to represent a protection
        !           369:    *    -level negotiation message
        !           370:    *
        !           371:    *  - "len" is the length of the "token" field in octets
        !           372:    *
        !           373:    *  - "token" is the GSS-API encapsulated protection level
        !           374:    *
        !           375:    * The token is produced by encapsulating an octet containing the
        !           376:    * required protection level using gss_seal()/gss_wrap() with conf_req
        !           377:    * set to FALSE.  The token is verified using gss_unseal()/
        !           378:    * gss_unwrap().
        !           379:    *
        !           380:    */
        !           381:   if(data->set.socks5_gssapi_nec) {
        !           382:     us_length = htons((short)1);
        !           383:     memcpy(socksreq + 2, &us_length, sizeof(short));
        !           384:   }
        !           385:   else {
        !           386:     gss_send_token.length = 1;
        !           387:     gss_send_token.value = malloc(1);
        !           388:     if(!gss_send_token.value) {
        !           389:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           390:       return CURLE_OUT_OF_MEMORY;
        !           391:     }
        !           392:     memcpy(gss_send_token.value, &gss_enc, 1);
        !           393: 
        !           394:     gss_major_status = gss_wrap(&gss_minor_status, gss_context, 0,
        !           395:                                 GSS_C_QOP_DEFAULT, &gss_send_token,
        !           396:                                 &gss_conf_state, &gss_w_token);
        !           397: 
        !           398:     if(check_gss_err(data, gss_major_status, gss_minor_status, "gss_wrap")) {
        !           399:       gss_release_buffer(&gss_status, &gss_send_token);
        !           400:       gss_release_buffer(&gss_status, &gss_w_token);
        !           401:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           402:       failf(data, "Failed to wrap GSS-API encryption value into token.");
        !           403:       return CURLE_COULDNT_CONNECT;
        !           404:     }
        !           405:     gss_release_buffer(&gss_status, &gss_send_token);
        !           406: 
        !           407:     us_length = htons((short)gss_w_token.length);
        !           408:     memcpy(socksreq + 2, &us_length, sizeof(short));
        !           409:   }
        !           410: 
        !           411:   code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
        !           412:   if(code  || (4 != written)) {
        !           413:     failf(data, "Failed to send GSS-API encryption request.");
        !           414:     gss_release_buffer(&gss_status, &gss_w_token);
        !           415:     gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           416:     return CURLE_COULDNT_CONNECT;
        !           417:   }
        !           418: 
        !           419:   if(data->set.socks5_gssapi_nec) {
        !           420:     memcpy(socksreq, &gss_enc, 1);
        !           421:     code = Curl_write_plain(conn, sock, socksreq, 1, &written);
        !           422:     if(code || ( 1 != written)) {
        !           423:       failf(data, "Failed to send GSS-API encryption type.");
        !           424:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           425:       return CURLE_COULDNT_CONNECT;
        !           426:     }
        !           427:   }
        !           428:   else {
        !           429:     code = Curl_write_plain(conn, sock, (char *)gss_w_token.value,
        !           430:                             gss_w_token.length, &written);
        !           431:     if(code || ((ssize_t)gss_w_token.length != written)) {
        !           432:       failf(data, "Failed to send GSS-API encryption type.");
        !           433:       gss_release_buffer(&gss_status, &gss_w_token);
        !           434:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           435:       return CURLE_COULDNT_CONNECT;
        !           436:     }
        !           437:     gss_release_buffer(&gss_status, &gss_w_token);
        !           438:   }
        !           439: 
        !           440:   result = Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread);
        !           441:   if(result || (actualread != 4)) {
        !           442:     failf(data, "Failed to receive GSS-API encryption response.");
        !           443:     gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           444:     return CURLE_COULDNT_CONNECT;
        !           445:   }
        !           446: 
        !           447:   /* ignore the first (VER) byte */
        !           448:   if(socksreq[1] == 255) { /* status / message type */
        !           449:     failf(data, "User was rejected by the SOCKS5 server (%d %d).",
        !           450:           socksreq[0], socksreq[1]);
        !           451:     gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           452:     return CURLE_COULDNT_CONNECT;
        !           453:   }
        !           454: 
        !           455:   if(socksreq[1] != 2) { /* status / messgae type */
        !           456:     failf(data, "Invalid GSS-API encryption response type (%d %d).",
        !           457:           socksreq[0], socksreq[1]);
        !           458:     gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           459:     return CURLE_COULDNT_CONNECT;
        !           460:   }
        !           461: 
        !           462:   memcpy(&us_length, socksreq + 2, sizeof(short));
        !           463:   us_length = ntohs(us_length);
        !           464: 
        !           465:   gss_recv_token.length = us_length;
        !           466:   gss_recv_token.value = malloc(gss_recv_token.length);
        !           467:   if(!gss_recv_token.value) {
        !           468:     gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           469:     return CURLE_OUT_OF_MEMORY;
        !           470:   }
        !           471:   result = Curl_blockread_all(conn, sock, (char *)gss_recv_token.value,
        !           472:                               gss_recv_token.length, &actualread);
        !           473: 
        !           474:   if(result || (actualread != us_length)) {
        !           475:     failf(data, "Failed to receive GSS-API encryptrion type.");
        !           476:     gss_release_buffer(&gss_status, &gss_recv_token);
        !           477:     gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           478:     return CURLE_COULDNT_CONNECT;
        !           479:   }
        !           480: 
        !           481:   if(!data->set.socks5_gssapi_nec) {
        !           482:     gss_major_status = gss_unwrap(&gss_minor_status, gss_context,
        !           483:                                   &gss_recv_token, &gss_w_token,
        !           484:                                   0, GSS_C_QOP_DEFAULT);
        !           485: 
        !           486:     if(check_gss_err(data, gss_major_status, gss_minor_status, "gss_unwrap")) {
        !           487:       gss_release_buffer(&gss_status, &gss_recv_token);
        !           488:       gss_release_buffer(&gss_status, &gss_w_token);
        !           489:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           490:       failf(data, "Failed to unwrap GSS-API encryption value into token.");
        !           491:       return CURLE_COULDNT_CONNECT;
        !           492:     }
        !           493:     gss_release_buffer(&gss_status, &gss_recv_token);
        !           494: 
        !           495:     if(gss_w_token.length != 1) {
        !           496:       failf(data, "Invalid GSS-API encryption response length (%d).",
        !           497:             gss_w_token.length);
        !           498:       gss_release_buffer(&gss_status, &gss_w_token);
        !           499:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           500:       return CURLE_COULDNT_CONNECT;
        !           501:     }
        !           502: 
        !           503:     memcpy(socksreq, gss_w_token.value, gss_w_token.length);
        !           504:     gss_release_buffer(&gss_status, &gss_w_token);
        !           505:   }
        !           506:   else {
        !           507:     if(gss_recv_token.length != 1) {
        !           508:       failf(data, "Invalid GSS-API encryption response length (%d).",
        !           509:             gss_recv_token.length);
        !           510:       gss_release_buffer(&gss_status, &gss_recv_token);
        !           511:       gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           512:       return CURLE_COULDNT_CONNECT;
        !           513:     }
        !           514: 
        !           515:     memcpy(socksreq, gss_recv_token.value, gss_recv_token.length);
        !           516:     gss_release_buffer(&gss_status, &gss_recv_token);
        !           517:   }
        !           518: 
        !           519:   (void)curlx_nonblock(sock, TRUE);
        !           520: 
        !           521:   infof(data, "SOCKS5 access with%s protection granted.\n",
        !           522:         (socksreq[0] == 0)?"out GSS-API data":
        !           523:         ((socksreq[0] == 1)?" GSS-API integrity":" GSS-API confidentiality"));
        !           524: 
        !           525:   conn->socks5_gssapi_enctype = socksreq[0];
        !           526:   if(socksreq[0] == 0)
        !           527:     gss_delete_sec_context(&gss_status, &gss_context, NULL);
        !           528: 
        !           529:   return CURLE_OK;
        !           530: }
        !           531: 
        !           532: #endif /* HAVE_GSSAPI && !CURL_DISABLE_PROXY */

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