Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 1 | /*************************************************************************** |
| 2 | * _ _ ____ _ |
| 3 | * Project ___| | | | _ \| | |
| 4 | * / __| | | | |_) | | |
| 5 | * | (__| |_| | _ <| |___ |
| 6 | * \___|\___/|_| \_\_____| |
| 7 | * |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 8 | * Copyright (C) 2009, Markus Moeller, <markus_moeller@compuserve.com> |
| 9 | * Copyright (C) 2012 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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 |
Alex Deymo | d15eaac | 2016-06-28 14:49:26 -0700 | [diff] [blame] | 13 | * are also available at https://curl.haxx.se/docs/copyright.html. |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 24 | #include "curl_setup.h" |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 25 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 26 | #if defined(HAVE_GSSAPI) && !defined(CURL_DISABLE_PROXY) |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 27 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 28 | #include "curl_gssapi.h" |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 29 | #include "urldata.h" |
| 30 | #include "sendf.h" |
| 31 | #include "connect.h" |
| 32 | #include "timeval.h" |
| 33 | #include "socks.h" |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 34 | #include "warnless.h" |
Alex Deymo | d15eaac | 2016-06-28 14:49:26 -0700 | [diff] [blame] | 35 | |
| 36 | /* The last 3 #include files should be in this order */ |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 37 | #include "curl_printf.h" |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 38 | #include "curl_memory.h" |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 39 | #include "memdebug.h" |
| 40 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 41 | static gss_ctx_id_t gss_context = GSS_C_NO_CONTEXT; |
| 42 | |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 43 | /* |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 44 | * Helper GSS-API error functions. |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 45 | */ |
Alex Deymo | e3149cc | 2016-10-05 11:18:42 -0700 | [diff] [blame] | 46 | static int check_gss_err(struct Curl_easy *data, |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 47 | OM_uint32 major_status, |
| 48 | OM_uint32 minor_status, |
Elliott Hughes | cee0338 | 2017-06-23 12:17:18 -0700 | [diff] [blame] | 49 | const char *function) |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 50 | { |
| 51 | if(GSS_ERROR(major_status)) { |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 52 | OM_uint32 maj_stat, min_stat; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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) { |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 68 | strcpy(buf + len, (char *) status_string.value); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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) { |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 77 | strcpy(buf + len, ".\n"); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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) { |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 88 | if(sizeof(buf) > len + status_string.length) |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 89 | strcpy(buf + len, (char *) status_string.value); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 90 | gss_release_buffer(&min_stat, &status_string); |
| 91 | break; |
| 92 | } |
| 93 | gss_release_buffer(&min_stat, &status_string); |
| 94 | } |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 95 | failf(data, "GSS-API error: %s failed:\n%s", function, buf); |
| 96 | return 1; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 97 | } |
| 98 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 99 | return 0; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex, |
| 103 | struct connectdata *conn) |
| 104 | { |
Alex Deymo | e3149cc | 2016-10-05 11:18:42 -0700 | [diff] [blame] | 105 | struct Curl_easy *data = conn->data; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 106 | curl_socket_t sock = conn->sock[sockindex]; |
| 107 | CURLcode code; |
| 108 | ssize_t actualread; |
| 109 | ssize_t written; |
| 110 | int result; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 121 | unsigned short us_length; |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 122 | char *user = NULL; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 123 | unsigned char socksreq[4]; /* room for GSS-API exchange header only */ |
Alex Deymo | d15eaac | 2016-06-28 14:49:26 -0700 | [diff] [blame] | 124 | const char *serviceptr = data->set.str[STRING_PROXY_SERVICE_NAME] ? |
| 125 | data->set.str[STRING_PROXY_SERVICE_NAME] : "rcmd"; |
Elliott Hughes | cee0338 | 2017-06-23 12:17:18 -0700 | [diff] [blame] | 126 | const size_t serviceptr_length = strlen(serviceptr); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 127 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 128 | /* GSS-API request looks like |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 129 | * +----+------+-----+----------------+ |
| 130 | * |VER | MTYP | LEN | TOKEN | |
| 131 | * +----+------+----------------------+ |
| 132 | * | 1 | 1 | 2 | up to 2^16 - 1 | |
| 133 | * +----+------+-----+----------------+ |
| 134 | */ |
| 135 | |
| 136 | /* prepare service name */ |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 137 | if(strchr(serviceptr, '/')) { |
Elliott Hughes | cee0338 | 2017-06-23 12:17:18 -0700 | [diff] [blame] | 138 | service.length = serviceptr_length; |
| 139 | service.value = malloc(service.length); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 140 | if(!service.value) |
| 141 | return CURLE_OUT_OF_MEMORY; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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 { |
Elliott Hughes | cee0338 | 2017-06-23 12:17:18 -0700 | [diff] [blame] | 148 | service.value = malloc(serviceptr_length + |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 149 | strlen(conn->socks_proxy.host.name) + 2); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 150 | if(!service.value) |
| 151 | return CURLE_OUT_OF_MEMORY; |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 152 | service.length = serviceptr_length + |
| 153 | strlen(conn->socks_proxy.host.name) + 1; |
| 154 | snprintf(service.value, service.length + 1, "%s@%s", |
Elliott Hughes | cee0338 | 2017-06-23 12:17:18 -0700 | [diff] [blame] | 155 | serviceptr, conn->socks_proxy.host.name); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 156 | |
| 157 | gss_major_status = gss_import_name(&gss_minor_status, &service, |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 158 | GSS_C_NT_HOSTBASED_SERVICE, &server); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | gss_release_buffer(&gss_status, &service); /* clear allocated memory */ |
| 162 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 163 | if(check_gss_err(data, gss_major_status, |
| 164 | gss_minor_status, "gss_import_name()")) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 165 | failf(data, "Failed to create service name."); |
| 166 | gss_release_name(&gss_status, &server); |
| 167 | return CURLE_COULDNT_CONNECT; |
| 168 | } |
| 169 | |
| 170 | /* As long as we need to keep sending some context info, and there's no */ |
| 171 | /* errors, keep sending it... */ |
| 172 | for(;;) { |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 173 | gss_major_status = Curl_gss_init_sec_context(data, |
| 174 | &gss_minor_status, |
| 175 | &gss_context, |
| 176 | server, |
| 177 | &Curl_krb5_mech_oid, |
| 178 | NULL, |
| 179 | gss_token, |
| 180 | &gss_send_token, |
| 181 | TRUE, |
| 182 | &gss_ret_flags); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 183 | |
| 184 | if(gss_token != GSS_C_NO_BUFFER) |
| 185 | gss_release_buffer(&gss_status, &gss_recv_token); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 186 | if(check_gss_err(data, gss_major_status, |
| 187 | gss_minor_status, "gss_init_sec_context")) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 188 | gss_release_name(&gss_status, &server); |
| 189 | gss_release_buffer(&gss_status, &gss_recv_token); |
| 190 | gss_release_buffer(&gss_status, &gss_send_token); |
| 191 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 192 | failf(data, "Failed to initial GSS-API token."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 193 | return CURLE_COULDNT_CONNECT; |
| 194 | } |
| 195 | |
| 196 | if(gss_send_token.length != 0) { |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 197 | socksreq[0] = 1; /* GSS-API subnegotiation version */ |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 198 | socksreq[1] = 1; /* authentication message type */ |
| 199 | us_length = htons((short)gss_send_token.length); |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 200 | memcpy(socksreq + 2, &us_length, sizeof(short)); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 201 | |
| 202 | code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 203 | if(code || (4 != written)) { |
| 204 | failf(data, "Failed to send GSS-API authentication request."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 205 | gss_release_name(&gss_status, &server); |
| 206 | gss_release_buffer(&gss_status, &gss_recv_token); |
| 207 | gss_release_buffer(&gss_status, &gss_send_token); |
| 208 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 209 | return CURLE_COULDNT_CONNECT; |
| 210 | } |
| 211 | |
| 212 | code = Curl_write_plain(conn, sock, (char *)gss_send_token.value, |
| 213 | gss_send_token.length, &written); |
| 214 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 215 | if(code || ((ssize_t)gss_send_token.length != written)) { |
| 216 | failf(data, "Failed to send GSS-API authentication token."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 217 | gss_release_name(&gss_status, &server); |
| 218 | gss_release_buffer(&gss_status, &gss_recv_token); |
| 219 | gss_release_buffer(&gss_status, &gss_send_token); |
| 220 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 221 | return CURLE_COULDNT_CONNECT; |
| 222 | } |
| 223 | |
| 224 | } |
| 225 | |
| 226 | gss_release_buffer(&gss_status, &gss_send_token); |
| 227 | gss_release_buffer(&gss_status, &gss_recv_token); |
| 228 | if(gss_major_status != GSS_S_CONTINUE_NEEDED) break; |
| 229 | |
| 230 | /* analyse response */ |
| 231 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 232 | /* GSS-API response looks like |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 233 | * +----+------+-----+----------------+ |
| 234 | * |VER | MTYP | LEN | TOKEN | |
| 235 | * +----+------+----------------------+ |
| 236 | * | 1 | 1 | 2 | up to 2^16 - 1 | |
| 237 | * +----+------+-----+----------------+ |
| 238 | */ |
| 239 | |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 240 | result = Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 241 | if(result || (actualread != 4)) { |
| 242 | failf(data, "Failed to receive GSS-API authentication response."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 243 | gss_release_name(&gss_status, &server); |
| 244 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 245 | return CURLE_COULDNT_CONNECT; |
| 246 | } |
| 247 | |
| 248 | /* ignore the first (VER) byte */ |
| 249 | if(socksreq[1] == 255) { /* status / message type */ |
| 250 | failf(data, "User was rejected by the SOCKS5 server (%d %d).", |
| 251 | socksreq[0], socksreq[1]); |
| 252 | gss_release_name(&gss_status, &server); |
| 253 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 254 | return CURLE_COULDNT_CONNECT; |
| 255 | } |
| 256 | |
| 257 | if(socksreq[1] != 1) { /* status / messgae type */ |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 258 | failf(data, "Invalid GSS-API authentication response type (%d %d).", |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 259 | socksreq[0], socksreq[1]); |
| 260 | gss_release_name(&gss_status, &server); |
| 261 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 262 | return CURLE_COULDNT_CONNECT; |
| 263 | } |
| 264 | |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 265 | memcpy(&us_length, socksreq + 2, sizeof(short)); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 266 | us_length = ntohs(us_length); |
| 267 | |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 268 | gss_recv_token.length = us_length; |
| 269 | gss_recv_token.value = malloc(us_length); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 270 | if(!gss_recv_token.value) { |
| 271 | failf(data, |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 272 | "Could not allocate memory for GSS-API authentication " |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 273 | "response token."); |
| 274 | gss_release_name(&gss_status, &server); |
| 275 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 276 | return CURLE_OUT_OF_MEMORY; |
| 277 | } |
| 278 | |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 279 | result = Curl_blockread_all(conn, sock, (char *)gss_recv_token.value, |
| 280 | gss_recv_token.length, &actualread); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 281 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 282 | if(result || (actualread != us_length)) { |
| 283 | failf(data, "Failed to receive GSS-API authentication token."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 284 | gss_release_name(&gss_status, &server); |
| 285 | gss_release_buffer(&gss_status, &gss_recv_token); |
| 286 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 287 | return CURLE_COULDNT_CONNECT; |
| 288 | } |
| 289 | |
| 290 | gss_token = &gss_recv_token; |
| 291 | } |
| 292 | |
| 293 | gss_release_name(&gss_status, &server); |
| 294 | |
| 295 | /* Everything is good so far, user was authenticated! */ |
Elliott Hughes | 82be86d | 2017-09-20 17:00:17 -0700 | [diff] [blame] | 296 | gss_major_status = gss_inquire_context(&gss_minor_status, gss_context, |
| 297 | &gss_client_name, NULL, NULL, NULL, |
| 298 | NULL, NULL, NULL); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 299 | if(check_gss_err(data, gss_major_status, |
| 300 | gss_minor_status, "gss_inquire_context")) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 301 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 302 | gss_release_name(&gss_status, &gss_client_name); |
| 303 | failf(data, "Failed to determine user name."); |
| 304 | return CURLE_COULDNT_CONNECT; |
| 305 | } |
| 306 | gss_major_status = gss_display_name(&gss_minor_status, gss_client_name, |
| 307 | &gss_send_token, NULL); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 308 | if(check_gss_err(data, gss_major_status, |
| 309 | gss_minor_status, "gss_display_name")) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 310 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 311 | gss_release_name(&gss_status, &gss_client_name); |
| 312 | gss_release_buffer(&gss_status, &gss_send_token); |
| 313 | failf(data, "Failed to determine user name."); |
| 314 | return CURLE_COULDNT_CONNECT; |
| 315 | } |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 316 | user = malloc(gss_send_token.length + 1); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 317 | if(!user) { |
| 318 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 319 | gss_release_name(&gss_status, &gss_client_name); |
| 320 | gss_release_buffer(&gss_status, &gss_send_token); |
| 321 | return CURLE_OUT_OF_MEMORY; |
| 322 | } |
| 323 | |
| 324 | memcpy(user, gss_send_token.value, gss_send_token.length); |
| 325 | user[gss_send_token.length] = '\0'; |
| 326 | gss_release_name(&gss_status, &gss_client_name); |
| 327 | gss_release_buffer(&gss_status, &gss_send_token); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 328 | infof(data, "SOCKS5 server authencticated user %s with GSS-API.\n",user); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 329 | free(user); |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 330 | user = NULL; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 331 | |
| 332 | /* Do encryption */ |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 333 | socksreq[0] = 1; /* GSS-API subnegotiation version */ |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 334 | socksreq[1] = 2; /* encryption message type */ |
| 335 | |
| 336 | gss_enc = 0; /* no data protection */ |
| 337 | /* do confidentiality protection if supported */ |
| 338 | if(gss_ret_flags & GSS_C_CONF_FLAG) |
| 339 | gss_enc = 2; |
| 340 | /* else do integrity protection */ |
| 341 | else if(gss_ret_flags & GSS_C_INTEG_FLAG) |
| 342 | gss_enc = 1; |
| 343 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 344 | infof(data, "SOCKS5 server supports GSS-API %s data protection.\n", |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 345 | (gss_enc == 0)?"no":((gss_enc==1)?"integrity":"confidentiality")); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 346 | /* force for the moment to no data protection */ |
| 347 | gss_enc = 0; |
| 348 | /* |
| 349 | * Sending the encryption type in clear seems wrong. It should be |
| 350 | * protected with gss_seal()/gss_wrap(). See RFC1961 extract below |
| 351 | * The NEC reference implementations on which this is based is |
| 352 | * therefore at fault |
| 353 | * |
| 354 | * +------+------+------+.......................+ |
| 355 | * + ver | mtyp | len | token | |
| 356 | * +------+------+------+.......................+ |
| 357 | * + 0x01 | 0x02 | 0x02 | up to 2^16 - 1 octets | |
| 358 | * +------+------+------+.......................+ |
| 359 | * |
| 360 | * Where: |
| 361 | * |
| 362 | * - "ver" is the protocol version number, here 1 to represent the |
| 363 | * first version of the SOCKS/GSS-API protocol |
| 364 | * |
| 365 | * - "mtyp" is the message type, here 2 to represent a protection |
| 366 | * -level negotiation message |
| 367 | * |
| 368 | * - "len" is the length of the "token" field in octets |
| 369 | * |
| 370 | * - "token" is the GSS-API encapsulated protection level |
| 371 | * |
| 372 | * The token is produced by encapsulating an octet containing the |
| 373 | * required protection level using gss_seal()/gss_wrap() with conf_req |
| 374 | * set to FALSE. The token is verified using gss_unseal()/ |
| 375 | * gss_unwrap(). |
| 376 | * |
| 377 | */ |
| 378 | if(data->set.socks5_gssapi_nec) { |
| 379 | us_length = htons((short)1); |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 380 | memcpy(socksreq + 2, &us_length, sizeof(short)); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 381 | } |
| 382 | else { |
| 383 | gss_send_token.length = 1; |
| 384 | gss_send_token.value = malloc(1); |
| 385 | if(!gss_send_token.value) { |
| 386 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 387 | return CURLE_OUT_OF_MEMORY; |
| 388 | } |
| 389 | memcpy(gss_send_token.value, &gss_enc, 1); |
| 390 | |
| 391 | gss_major_status = gss_wrap(&gss_minor_status, gss_context, 0, |
| 392 | GSS_C_QOP_DEFAULT, &gss_send_token, |
| 393 | &gss_conf_state, &gss_w_token); |
| 394 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 395 | if(check_gss_err(data, gss_major_status, gss_minor_status, "gss_wrap")) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 396 | gss_release_buffer(&gss_status, &gss_send_token); |
| 397 | gss_release_buffer(&gss_status, &gss_w_token); |
| 398 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 399 | failf(data, "Failed to wrap GSS-API encryption value into token."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 400 | return CURLE_COULDNT_CONNECT; |
| 401 | } |
| 402 | gss_release_buffer(&gss_status, &gss_send_token); |
| 403 | |
| 404 | us_length = htons((short)gss_w_token.length); |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 405 | memcpy(socksreq + 2, &us_length, sizeof(short)); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 409 | if(code || (4 != written)) { |
| 410 | failf(data, "Failed to send GSS-API encryption request."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 411 | gss_release_buffer(&gss_status, &gss_w_token); |
| 412 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 413 | return CURLE_COULDNT_CONNECT; |
| 414 | } |
| 415 | |
| 416 | if(data->set.socks5_gssapi_nec) { |
| 417 | memcpy(socksreq, &gss_enc, 1); |
| 418 | code = Curl_write_plain(conn, sock, socksreq, 1, &written); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 419 | if(code || ( 1 != written)) { |
| 420 | failf(data, "Failed to send GSS-API encryption type."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 421 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 422 | return CURLE_COULDNT_CONNECT; |
| 423 | } |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 424 | } |
| 425 | else { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 426 | code = Curl_write_plain(conn, sock, (char *)gss_w_token.value, |
| 427 | gss_w_token.length, &written); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 428 | if(code || ((ssize_t)gss_w_token.length != written)) { |
| 429 | failf(data, "Failed to send GSS-API encryption type."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 430 | gss_release_buffer(&gss_status, &gss_w_token); |
| 431 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 432 | return CURLE_COULDNT_CONNECT; |
| 433 | } |
| 434 | gss_release_buffer(&gss_status, &gss_w_token); |
| 435 | } |
| 436 | |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 437 | result = Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 438 | if(result || (actualread != 4)) { |
| 439 | failf(data, "Failed to receive GSS-API encryption response."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 440 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 441 | return CURLE_COULDNT_CONNECT; |
| 442 | } |
| 443 | |
| 444 | /* ignore the first (VER) byte */ |
| 445 | if(socksreq[1] == 255) { /* status / message type */ |
| 446 | failf(data, "User was rejected by the SOCKS5 server (%d %d).", |
| 447 | socksreq[0], socksreq[1]); |
| 448 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 449 | return CURLE_COULDNT_CONNECT; |
| 450 | } |
| 451 | |
| 452 | if(socksreq[1] != 2) { /* status / messgae type */ |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 453 | failf(data, "Invalid GSS-API encryption response type (%d %d).", |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 454 | socksreq[0], socksreq[1]); |
| 455 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 456 | return CURLE_COULDNT_CONNECT; |
| 457 | } |
| 458 | |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 459 | memcpy(&us_length, socksreq + 2, sizeof(short)); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 460 | us_length = ntohs(us_length); |
| 461 | |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 462 | gss_recv_token.length = us_length; |
| 463 | gss_recv_token.value = malloc(gss_recv_token.length); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 464 | if(!gss_recv_token.value) { |
| 465 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 466 | return CURLE_OUT_OF_MEMORY; |
| 467 | } |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 468 | result = Curl_blockread_all(conn, sock, (char *)gss_recv_token.value, |
| 469 | gss_recv_token.length, &actualread); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 470 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 471 | if(result || (actualread != us_length)) { |
| 472 | failf(data, "Failed to receive GSS-API encryptrion type."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 473 | gss_release_buffer(&gss_status, &gss_recv_token); |
| 474 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 475 | return CURLE_COULDNT_CONNECT; |
| 476 | } |
| 477 | |
| 478 | if(!data->set.socks5_gssapi_nec) { |
| 479 | gss_major_status = gss_unwrap(&gss_minor_status, gss_context, |
| 480 | &gss_recv_token, &gss_w_token, |
| 481 | 0, GSS_C_QOP_DEFAULT); |
| 482 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 483 | if(check_gss_err(data, gss_major_status, gss_minor_status, "gss_unwrap")) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 484 | gss_release_buffer(&gss_status, &gss_recv_token); |
| 485 | gss_release_buffer(&gss_status, &gss_w_token); |
| 486 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 487 | failf(data, "Failed to unwrap GSS-API encryption value into token."); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 488 | return CURLE_COULDNT_CONNECT; |
| 489 | } |
| 490 | gss_release_buffer(&gss_status, &gss_recv_token); |
| 491 | |
| 492 | if(gss_w_token.length != 1) { |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 493 | failf(data, "Invalid GSS-API encryption response length (%d).", |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 494 | gss_w_token.length); |
| 495 | gss_release_buffer(&gss_status, &gss_w_token); |
| 496 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 497 | return CURLE_COULDNT_CONNECT; |
| 498 | } |
| 499 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 500 | memcpy(socksreq, gss_w_token.value, gss_w_token.length); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 501 | gss_release_buffer(&gss_status, &gss_w_token); |
| 502 | } |
| 503 | else { |
| 504 | if(gss_recv_token.length != 1) { |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 505 | failf(data, "Invalid GSS-API encryption response length (%d).", |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 506 | gss_recv_token.length); |
| 507 | gss_release_buffer(&gss_status, &gss_recv_token); |
| 508 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 509 | return CURLE_COULDNT_CONNECT; |
| 510 | } |
| 511 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 512 | memcpy(socksreq, gss_recv_token.value, gss_recv_token.length); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 513 | gss_release_buffer(&gss_status, &gss_recv_token); |
| 514 | } |
| 515 | |
| 516 | infof(data, "SOCKS5 access with%s protection granted.\n", |
Alex Deymo | 486467e | 2017-12-19 19:04:07 +0100 | [diff] [blame] | 517 | (socksreq[0] == 0)?"out GSS-API data": |
| 518 | ((socksreq[0] == 1)?" GSS-API integrity":" GSS-API confidentiality")); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 519 | |
| 520 | conn->socks5_gssapi_enctype = socksreq[0]; |
| 521 | if(socksreq[0] == 0) |
| 522 | gss_delete_sec_context(&gss_status, &gss_context, NULL); |
| 523 | |
| 524 | return CURLE_OK; |
| 525 | } |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 526 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 527 | #endif /* HAVE_GSSAPI && !CURL_DISABLE_PROXY */ |