Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 1 | /* Component implementing a IMS server towards Asterisk's IMS UE |
| 2 | * (C) 2024 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
| 3 | * Author: Pau Espin Pedrol <pespin@sysmocom.de> |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Released under the terms of GNU General Public License, Version 2 or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 10 | */ |
| 11 | module IMS_ConnectionHandler { |
| 12 | |
Pau Espin Pedrol | 717379f | 2024-05-17 18:36:51 +0200 | [diff] [blame] | 13 | import from TCCEncoding_Functions all; |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 14 | import from TCCOpenSecurity_Functions all; |
| 15 | import from General_Types all; |
| 16 | import from Osmocom_Types all; |
| 17 | import from Native_Functions all; |
| 18 | import from Misc_Helpers all; |
| 19 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 20 | /* the PIPE asp port allows us to interact with ip xfrm via stdin/stdout */ |
| 21 | import from PIPEasp_PortType all; |
| 22 | import from PIPEasp_Types all; |
| 23 | import from PIPEasp_Templates all; |
| 24 | |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 25 | import from SDP_Types all; |
| 26 | import from SDP_Templates all; |
| 27 | |
| 28 | import from SIP_Emulation all; |
| 29 | import from SIPmsg_Types all; |
| 30 | import from SIP_Templates all; |
| 31 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 32 | |
| 33 | modulepar { |
| 34 | charstring mp_ipsec_setup_script_path := "./IMS_ipsec_setup.sh"; |
| 35 | } |
| 36 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 37 | const char c_sip_server_name := "osmo-ttcn3-hacks/0.23"; |
| 38 | |
| 39 | |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 40 | type port IMSCoord_PT message |
| 41 | { |
| 42 | inout charstring; |
| 43 | } with { extension "internal" }; |
| 44 | |
| 45 | const charstring IMS_COORD_CMD_REGISTERED := "COORD_CMD_REGISTERED"; |
| 46 | |
| 47 | type component IMS_ConnHdlr extends SIP_ConnHdlr { |
| 48 | var charstring g_name; |
| 49 | var IMS_ConnHdlrPars g_pars; |
| 50 | timer g_Tguard; |
| 51 | var PDU_SIP_Request g_rx_sip_req; |
| 52 | var PDU_SIP_Response g_rx_sip_resp; |
| 53 | |
| 54 | port IMSCoord_PT COORD; |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 55 | port PIPEasp_PT PIPE; |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 56 | } |
| 57 | type record of IMS_ConnHdlr IMS_ConnHdlrList; |
| 58 | |
| 59 | type record IMS_ConnHdlrPars { |
| 60 | float t_guard, |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 61 | charstring realm, |
| 62 | charstring local_sip_host, |
| 63 | uint16_t local_sip_port, |
| 64 | charstring remote_sip_host optional, |
| 65 | uint16_t remote_sip_port optional, |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 66 | charstring user, |
| 67 | charstring display_name, |
| 68 | charstring password, |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame^] | 69 | /* Expected User-Location-Info in P-Access-Network-Info */ |
| 70 | charstring uli_str, |
Pau Espin Pedrol | 717379f | 2024-05-17 18:36:51 +0200 | [diff] [blame] | 71 | octetstring rand, |
| 72 | octetstring autn, |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 73 | charstring ipsec_auth_key, |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 74 | integer ipsec_local_spi_c, |
| 75 | integer ipsec_local_spi_s, |
| 76 | integer ipsec_remote_spi_c optional, |
| 77 | integer ipsec_remote_spi_s optional, |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 78 | uint16_t ipsec_remote_port_c optional, |
| 79 | uint16_t ipsec_remote_port_s optional, |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 80 | SipUrl registrar_sip_req_uri, |
| 81 | SipAddr registrar_sip_record, |
| 82 | CallidString registrar_sip_call_id, |
| 83 | integer registrar_sip_seq_nr, |
| 84 | Via local_via, |
| 85 | SipUrl local_sip_url_ext, |
| 86 | SipAddr local_sip_record, |
| 87 | Contact local_contact, |
| 88 | IMS_CallPars cp optional |
| 89 | } |
| 90 | type record of IMS_ConnHdlrPars IMS_ConnHdlrParsList; |
| 91 | |
| 92 | type record IMS_CallParsMT { |
| 93 | /* Whether to wait for COORD.receive(COORD_CMD_PICKUP) before accepting the call. */ |
| 94 | boolean wait_coord_cmd_pickup, |
| 95 | /* Whether to expect CANCEL instead of ACK as answer to our OK */ |
| 96 | boolean exp_cancel |
| 97 | } |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 98 | template (value) IMS_CallParsMT t_IMS_CallParsMT := { |
| 99 | wait_coord_cmd_pickup := false, |
| 100 | exp_cancel := false |
| 101 | } |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 102 | |
| 103 | type record IMS_CallPars { |
| 104 | SipAddr calling optional, |
| 105 | SipAddr called optional, |
| 106 | |
| 107 | SipAddr from_addr optional, |
| 108 | SipAddr to_addr optional, |
| 109 | |
| 110 | CallidString sip_call_id, |
| 111 | integer sip_seq_nr, |
| 112 | charstring sip_body optional, |
| 113 | |
| 114 | charstring local_rtp_addr, |
| 115 | uint16_t local_rtp_port, |
| 116 | |
| 117 | SDP_Message peer_sdp optional, |
| 118 | IMS_CallParsMT mt |
| 119 | } |
| 120 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 121 | template (value) IMS_CallPars t_IMS_CallPars(charstring local_rtp_addr, |
| 122 | uint16_t local_rtp_port := 0, |
| 123 | template (omit) SipAddr calling := omit, |
| 124 | template (omit) SipAddr called := omit) := { |
| 125 | calling := calling, |
| 126 | called := called, |
| 127 | from_addr := omit, |
| 128 | to_addr := omit, |
| 129 | sip_call_id := hex2str(f_rnd_hexstring(15)), |
| 130 | sip_seq_nr := f_sip_rand_seq_nr(), |
| 131 | sip_body := omit, |
| 132 | local_rtp_addr := local_rtp_addr, |
| 133 | local_rtp_port := local_rtp_port, |
| 134 | peer_sdp := omit, |
| 135 | mt := t_IMS_CallParsMT |
| 136 | } |
| 137 | |
| 138 | template (value) IMS_ConnHdlrPars t_IMS_Pars(charstring local_sip_host, |
| 139 | uint16_t local_sip_port, |
| 140 | charstring user, |
| 141 | charstring display_name := "Anonymous", |
| 142 | charstring password := "secret", |
| 143 | template (omit) IMS_CallPars cp := omit) := { |
| 144 | t_guard := 30.0, |
| 145 | realm := local_sip_host, |
| 146 | local_sip_host := local_sip_host, |
| 147 | local_sip_port := local_sip_port, |
| 148 | remote_sip_host := omit, |
| 149 | remote_sip_port := omit, |
| 150 | user := user, |
| 151 | display_name := f_sip_str_quote(display_name), |
| 152 | password := password, |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame^] | 153 | uli_str := "2380100010000101", |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 154 | /* The Nonce field is the Base64 encoded version of the RAND value and concatenated with the AUTN: */ |
Pau Espin Pedrol | 717379f | 2024-05-17 18:36:51 +0200 | [diff] [blame] | 155 | rand := '14987631f65f8e3788a0798b6ebcd08e'O, |
| 156 | autn := 'f6e19a7ccb028000a06b19c9544516e5'O, |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 157 | ipsec_auth_key := "0x5238297dfcca759bd05d48ff49bc63fa00000000", |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 158 | ipsec_local_spi_c := 4142, |
| 159 | ipsec_local_spi_s := 4143, |
| 160 | ipsec_remote_spi_c := omit, |
| 161 | ipsec_remote_spi_s := omit, |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 162 | ipsec_remote_port_c := omit, |
| 163 | ipsec_remote_port_s := omit, |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 164 | registrar_sip_req_uri := valueof(ts_SipUrlHost(local_sip_host)), |
| 165 | registrar_sip_record := ts_SipAddr(ts_HostPort(local_sip_host), |
| 166 | ts_UserInfo(user), |
| 167 | f_sip_str_quote(display_name)), |
| 168 | registrar_sip_call_id := hex2str(f_rnd_hexstring(15)) & "@" & local_sip_host, |
| 169 | registrar_sip_seq_nr := f_sip_rand_seq_nr(), |
| 170 | local_via := ts_Via_from(ts_HostPort(local_sip_host, local_sip_port)), |
| 171 | local_sip_url_ext := ts_SipUrl(ts_HostPort(local_sip_host, local_sip_port), |
| 172 | ts_UserInfo(user)), |
| 173 | local_sip_record := ts_SipAddr(ts_HostPort(local_sip_host), |
| 174 | ts_UserInfo(user)), |
| 175 | local_contact := valueof(ts_Contact({ |
| 176 | ts_ContactAddress( |
| 177 | ts_Addr_Union_SipUrl(ts_SipUrl(ts_HostPort( |
| 178 | local_sip_host, |
| 179 | local_sip_port), |
| 180 | ts_UserInfo(user))), |
| 181 | omit) |
| 182 | })), |
| 183 | cp := cp |
| 184 | } |
| 185 | |
| 186 | private altstep as_Tguard() runs on IMS_ConnHdlr { |
| 187 | [] g_Tguard.timeout { |
| 188 | setverdict(fail, "Tguard timeout"); |
| 189 | mtc.stop; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | type function ims_void_fn(charstring id) runs on IMS_ConnHdlr; |
| 194 | function f_ims_handler_init(ims_void_fn fn, charstring id, IMS_ConnHdlrPars pars) |
| 195 | runs on IMS_ConnHdlr { |
| 196 | g_name := id; |
| 197 | g_pars := pars; |
| 198 | g_Tguard.start(pars.t_guard); |
| 199 | activate(as_Tguard()); |
| 200 | |
| 201 | /* call the user-supied test case function */ |
| 202 | fn.apply(id); |
| 203 | } |
| 204 | |
| 205 | private altstep as_SIP_fail_req(charstring exp_msg_str := "") runs on IMS_ConnHdlr |
| 206 | { |
| 207 | var PDU_SIP_Request sip_req; |
| 208 | [] SIP.receive(PDU_SIP_Request:?) -> value sip_req { |
| 209 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 210 | log2str(g_name & ": Received unexpected SIP Req message := ", sip_req, "\nvs exp := ", exp_msg_str)); |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | private altstep as_SIP_fail_resp(charstring exp_msg_str := "") runs on IMS_ConnHdlr |
| 215 | { |
| 216 | var PDU_SIP_Response sip_resp; |
| 217 | [] SIP.receive(PDU_SIP_Response:?) -> value sip_resp { |
| 218 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 219 | log2str(g_name & ": Received unexpected SIP Resp message := ", sip_resp, "\nvs exp := ", exp_msg_str)); |
| 220 | } |
| 221 | } |
| 222 | |
Pau Espin Pedrol | 717379f | 2024-05-17 18:36:51 +0200 | [diff] [blame] | 223 | private function f_nonce_from_rand_autn(octetstring rand, octetstring autn) return charstring { |
| 224 | var octetstring concat := rand & autn; |
| 225 | var charstring nonce := enc_MIME_Base64(concat); |
| 226 | log("rand=", rand, " & autn=",autn, " => nonce=", nonce); |
| 227 | return nonce; |
| 228 | } |
| 229 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 230 | /* HTTP Digest Authentication Using AKA (AKAv1-MD5): RFC 3310 */ |
| 231 | function f_tr_Authorization_AKAv1MD5(WwwAuthenticate www_authenticate, |
| 232 | charstring username, |
| 233 | charstring uri, |
| 234 | integer nc_int := 1) |
| 235 | return template (present) Authorization { |
| 236 | var CommaParam_List digestCln; |
| 237 | var template (present) Authorization authorization; |
| 238 | var template (present) Credentials cred; |
| 239 | var template (omit) GenericParam rx_param; |
| 240 | |
| 241 | digestCln := www_authenticate.challenge[0].digestCln; |
| 242 | |
| 243 | var charstring algorithm := f_sip_param_get_value_present_or_fail(digestCln, "algorithm"); |
| 244 | var charstring realm := f_sip_param_get_value_present_or_fail(digestCln, "realm"); |
| 245 | var charstring nonce := f_sip_param_get_value_present_or_fail(digestCln, "nonce"); |
| 246 | |
| 247 | var template (present) CommaParam_List digestResponse := superset( |
| 248 | tr_Param("username", f_sip_str_quote(username)), |
| 249 | tr_Param("realm", f_sip_str_quote(realm)), |
| 250 | tr_Param("nonce", f_sip_str_quote(nonce)), |
| 251 | tr_Param("uri", f_sip_str_quote(uri)), |
| 252 | tr_Param("response", ?), |
| 253 | tr_Param("algorithm", algorithm), |
| 254 | tr_Param("qop", "auth"), |
| 255 | tr_Param("cnonce", ?), |
| 256 | tr_Param("nc", ?) |
| 257 | ); |
| 258 | cred := tr_Credentials_DigestResponse(digestResponse); |
| 259 | authorization := tr_Authorization(cred); |
| 260 | return authorization; |
| 261 | } |
| 262 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 263 | private function f_ims_validate_register_contact(Contact rx_contact) |
| 264 | { |
| 265 | /* IMS contact shows up like this: |
| 266 | * Contact: <sip:8adf9f3d-9342-4060-aa4f-a909f37fd6f6@192.168.101.2:5060>;+g.3gpp.accesstype="cellular2";video;audio;+g.3gpp.smsip;+g.3gpp.nw-init-ussi;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";+sip.instance="<urn:gsma:imei:35589811-338445-0>" |
| 267 | */ |
| 268 | /* TODO: "that the UE must include the IMS Communication Service Identifier (ICSI) |
| 269 | in the contact: header to indicate IMS Multimedia Telephony." */ |
| 270 | /* TODO: "The UE must include an IMEI URN in the +sip.instance header field |
| 271 | parameter of the contact: header." */ |
| 272 | /* TODO: "If the UE supports SMS over IP, it must include the feature tag |
| 273 | “+g.3gpp.smsip” in the contact: header." */ |
| 274 | /* TODO: "If the UE supports conversational audio and video service, then this must |
| 275 | be indicated by adding a “video” media feature tag to the contact: header." */ |
| 276 | } |
| 277 | |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame^] | 278 | /* Validate P-Access-Network-Info: RFC7315 6.4 */ |
| 279 | private function f_ims_validate_register_P_Access_Network_info(PDU_SIP_Request req, |
| 280 | boolean exp_present := true) runs on IMS_ConnHdlr |
| 281 | |
| 282 | { |
| 283 | if (not exp_present) { |
| 284 | if (ispresent(g_rx_sip_req.msgHeader.p_access_network_info)) { |
| 285 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 286 | log2str(g_name & ": Received unexpected [rfc7315 6.4] P-Access-Info := ", |
| 287 | g_rx_sip_req.msgHeader.p_access_network_info)); |
| 288 | } |
| 289 | return; |
| 290 | } |
| 291 | |
| 292 | /* exp_present: */ |
| 293 | var template (present) P_Access_Network_Info expl_tmpl := |
| 294 | tr_P_Access_Network_Info({ tr_Access_net_spec_EUTRAN(g_pars.uli_str) }); |
| 295 | |
| 296 | if (not ispresent(g_rx_sip_req.msgHeader.p_access_network_info)) { |
| 297 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 298 | log2str(g_name & ": Received no P-Access-Info vs exp := ", |
| 299 | expl_tmpl)); |
| 300 | } |
| 301 | if (not match(g_rx_sip_req.msgHeader.p_access_network_info, expl_tmpl)) { |
| 302 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 303 | log2str(g_name & ": Received unexpected P-Access-Info := ", |
| 304 | g_rx_sip_req.msgHeader.p_access_network_info, |
| 305 | "\nvs exp := ", expl_tmpl)); |
| 306 | } |
| 307 | } |
| 308 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 309 | private function f_ims_parse_security_client(Security_client security_client) runs on IMS_ConnHdlr |
| 310 | { |
| 311 | var boolean found := false; |
| 312 | for (var integer i := 0; i < lengthof(security_client.sec_mechanism_list); i := i + 1) { |
| 313 | var Security_mechanism sec_mec := security_client.sec_mechanism_list[i]; |
| 314 | if (sec_mec.mechanism_name != "ipsec-3gpp") { |
| 315 | log("Skipping Security Mechansim: ", sec_mec.mechanism_name); |
| 316 | continue; |
| 317 | } |
| 318 | var SemicolonParam_List sec_pars := sec_mec.mechanism_params; |
| 319 | var charstring par_val; |
| 320 | par_val := f_sip_param_get_value_present_or_fail(sec_pars, "alg"); |
| 321 | if (par_val != "hmac-sha-1-96") { |
| 322 | log("Skipping Security Mechansim Algo: ", par_val); |
| 323 | continue; |
| 324 | } |
| 325 | par_val := f_sip_param_get_value_present_or_fail(sec_pars, "spi-c"); |
| 326 | g_pars.ipsec_remote_spi_c := str2int(par_val); |
| 327 | par_val := f_sip_param_get_value_present_or_fail(sec_pars, "spi-s"); |
| 328 | g_pars.ipsec_remote_spi_s := str2int(par_val); |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 329 | par_val := f_sip_param_get_value_present_or_fail(sec_pars, "port-c"); |
| 330 | g_pars.ipsec_remote_port_c := str2int(par_val); |
| 331 | par_val := f_sip_param_get_value_present_or_fail(sec_pars, "port-s"); |
| 332 | g_pars.ipsec_remote_port_s := str2int(par_val); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 333 | found := true; |
| 334 | break; |
| 335 | } |
| 336 | |
| 337 | if (not found) { |
| 338 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 339 | log2str(g_name & "alg=hmac-sha-1-96 not found: ", security_client)); |
| 340 | } |
| 341 | |
| 342 | log("ipsec: remote_spi_c=", g_pars.ipsec_remote_spi_c, " remote_spi_s=", g_pars.ipsec_remote_spi_s, |
| 343 | "local_spi_c=", g_pars.ipsec_local_spi_c, " local_spi_s=", g_pars.ipsec_local_spi_s); |
| 344 | } |
| 345 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 346 | private function f_IMS_exec_sync(charstring cmdline, template (present) integer rc := 0) |
| 347 | runs on IMS_ConnHdlr return ASP_PResult { |
| 348 | var ASP_PResult res; |
| 349 | |
| 350 | map(self:PIPE, system:PIPE); |
| 351 | res := f_PIPEasp_exec_sync_PResult(PIPE, cmdline, tr_PResult(?, ?, rc)); |
| 352 | unmap(self:PIPE, system:PIPE); |
| 353 | |
| 354 | return res; |
| 355 | } |
| 356 | |
| 357 | private function f_ims_setup_ipsec() runs on IMS_ConnHdlr |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 358 | { |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 359 | var ASP_PResult res; |
| 360 | |
| 361 | var charstring cmd := mp_ipsec_setup_script_path & " " & |
| 362 | g_pars.local_sip_host & " " & |
| 363 | int2str(g_pars.local_sip_port) & " " & int2str(g_pars.ipsec_local_spi_c) & " " & |
| 364 | int2str(g_pars.local_sip_port) & " " & int2str(g_pars.ipsec_local_spi_s) & " " & |
| 365 | g_pars.remote_sip_host & " " & |
| 366 | int2str(g_pars.ipsec_remote_port_c) & " " & int2str(g_pars.ipsec_remote_spi_c) & " " & |
| 367 | int2str(g_pars.ipsec_remote_port_s) & " " & int2str(g_pars.ipsec_remote_spi_s) & " " & |
| 368 | g_pars.ipsec_auth_key; |
| 369 | |
| 370 | res := f_IMS_exec_sync(cmd); |
| 371 | |
| 372 | /* Debug applied rules: */ |
| 373 | /* |
| 374 | res := f_IMS_exec_sync("ip xfrm state"); |
| 375 | log("ip-xfrm-state Result-Stdout: " & res.stdout); |
| 376 | |
| 377 | res := f_IMS_exec_sync("ip xfrm policy"); |
| 378 | log("ip-xfrm-policy Result-Stdout: " & res.stdout); |
| 379 | */ |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 380 | } |
| 381 | |
| 382 | /* Peer is calling us, accept it: */ |
| 383 | altstep as_IMS_register(boolean exp_update_to_direct_rtp := true, |
| 384 | boolean fail_others := true) runs on IMS_ConnHdlr |
| 385 | { |
| 386 | var template (present) PDU_SIP_Request exp_req := |
| 387 | tr_SIP_REGISTER(g_pars.registrar_sip_req_uri, |
| 388 | ?, |
| 389 | tr_SipAddr(), |
| 390 | tr_SipAddr(), |
| 391 | tr_Via_from(?), |
| 392 | require := tr_Require(superset("sec-agree")), |
| 393 | security_client := tr_Security_client(superset(tr_Security_mechanism("ipsec-3gpp", |
| 394 | superset(tr_Param("alg","hmac-sha-1-96"))))), |
| 395 | supported := tr_Supported(superset("path", "sec-agree"))); |
| 396 | var charstring sip_expect_str := log2str(exp_req); |
| 397 | |
| 398 | [] SIP.receive(exp_req) -> value g_rx_sip_req { |
| 399 | var template (value) PDU_SIP_Response tx_resp; |
| 400 | var Via via; |
| 401 | var CallidString sip_call_id; |
| 402 | var Contact contact; |
| 403 | var template (value) SipAddr from_addr; |
| 404 | var template (value) SipAddr to_addr; |
| 405 | var template (value) CommaParam_List digestCln ; |
| 406 | var template (value) WwwAuthenticate wwwAuthenticate; |
| 407 | var template (value) Security_server security_server; |
| 408 | var template (value) Server server_name := ts_Server({c_sip_server_name}); |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 409 | var template (value) Require require := ts_Require({"sec-agree"}); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 410 | var template (value) Supported supported := ts_Supported({"sec-agree"}); |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 411 | var template (present) Authorization authorization; |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 412 | var integer sip_seq_nr; |
| 413 | var charstring tx_sdp; |
| 414 | |
| 415 | sip_call_id := g_rx_sip_req.msgHeader.callId.callid; |
| 416 | via := g_rx_sip_req.msgHeader.via; |
| 417 | via.viaBody[0].viaParams := f_sip_param_set(via.viaBody[0].viaParams, "rport", "1234"); /* TODO: set remote src port of the REGISTER */ |
| 418 | from_addr := ts_SipAddr_from_Addr_Union(g_rx_sip_req.msgHeader.fromField.addressField, |
| 419 | g_rx_sip_req.msgHeader.fromField.fromParams); |
| 420 | to_addr := ts_SipAddr_from_Addr_Union(g_rx_sip_req.msgHeader.toField.addressField, |
| 421 | g_rx_sip_req.msgHeader.toField.toParams); |
| 422 | sip_seq_nr := g_rx_sip_req.msgHeader.cSeq.seqNumber; |
| 423 | |
| 424 | contact := g_rx_sip_req.msgHeader.contact; |
| 425 | f_ims_validate_register_contact(contact); |
| 426 | |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame^] | 427 | /* Validate P-Access-Network-Info: rfc7315 6.4: |
| 428 | * "3GPP will use the P-Access-Network-Info header field to |
| 429 | * carry relatively sensitive information like the cell ID. Therefore, |
| 430 | * the information MUST NOT be sent outside of the 3GPP domain."" |
| 431 | * [...] "the sensitive information carried in the |
| 432 | * P-Access-Network-Info header field MUST NOT be sent in any initial |
| 433 | * unauthenticated and unprotected requests (e.g., REGISTER)." |
| 434 | */ |
| 435 | f_ims_validate_register_P_Access_Network_info(g_rx_sip_req, exp_present := false); |
| 436 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 437 | /* TODO: Validate "Expires" is 600000 */ |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 438 | |
| 439 | /* Tx 100 Tyring */ |
| 440 | tx_resp := ts_SIP_Response_Trying(sip_call_id, |
| 441 | from_addr, |
| 442 | to_addr, |
| 443 | via, |
| 444 | sip_seq_nr, |
| 445 | "REGISTER", |
| 446 | allow := omit, |
| 447 | server := server_name, |
| 448 | userAgent := omit); |
| 449 | SIP.send(tx_resp); |
| 450 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 451 | g_pars.remote_sip_host := valueof(contact.contactBody.contactAddresses[0].addressField.nameAddr.addrSpec.hostPort.host); |
| 452 | f_ims_parse_security_client(g_rx_sip_req.msgHeader.security_client); |
| 453 | f_ims_setup_ipsec(); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 454 | |
| 455 | to_addr.params := f_sip_param_set(to_addr.params, "tag", f_sip_rand_tag()); |
| 456 | |
| 457 | digestCln := { |
| 458 | ts_Param("realm", f_sip_str_quote(g_pars.realm)), |
| 459 | ts_Param("qop", f_sip_str_quote("auth")), |
| 460 | ts_Param("algorithm", "AKAv1-MD5"), |
Pau Espin Pedrol | 717379f | 2024-05-17 18:36:51 +0200 | [diff] [blame] | 461 | ts_Param("nonce", f_sip_str_quote(f_nonce_from_rand_autn(g_pars.rand, g_pars.autn))) |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 462 | /* "opaque not needed in IMS "*/ |
| 463 | }; |
| 464 | wwwAuthenticate := ts_WwwAuthenticate( { ts_Challenge_digestCln(digestCln) } ) |
| 465 | |
| 466 | /* Security-Server: ipsec-3gpp;q=0.1;prot=esp;mod=trans;spi-c=4096;spi-s=4097;port-c=5104;port-s=6104;alg=hmac-sha-1-96;ealg=null */ |
| 467 | var template (value) SemicolonParam_List sec_params := { |
| 468 | ts_Param("q", "0.1"), |
| 469 | ts_Param("prot", "esp"), |
| 470 | ts_Param("mod", "trans"), |
| 471 | ts_Param("spi-c", int2str(g_pars.ipsec_local_spi_c)), |
| 472 | ts_Param("spi-s", int2str(g_pars.ipsec_local_spi_s)), |
| 473 | ts_Param("port-c", int2str(g_pars.local_sip_port)), |
| 474 | ts_Param("port-s", int2str(g_pars.local_sip_port)), |
| 475 | ts_Param("alg", "hmac-sha-1-96"), |
| 476 | ts_Param("ealg", "null") |
| 477 | }; |
| 478 | security_server := ts_Security_server({ |
| 479 | ts_Security_mechanism("ipsec-3gpp", sec_params) |
| 480 | }); |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 481 | |
| 482 | /* Tx 401 Unauthorized */ |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 483 | tx_resp := ts_SIP_Response_Unauthorized(sip_call_id, |
| 484 | from_addr, |
| 485 | to_addr, |
| 486 | via, |
| 487 | wwwAuthenticate, |
| 488 | sip_seq_nr, |
| 489 | "REGISTER", |
| 490 | security_server := security_server, |
| 491 | server := server_name, |
| 492 | supported := supported, |
| 493 | userAgent := omit); |
| 494 | SIP.send(tx_resp); |
| 495 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 496 | /* Now we should receive a new REGISTER over ipsec: */ |
| 497 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 498 | /* TODO: Generate expected Authoritzation based on AKAv1-MD5: */ |
| 499 | /*authorization := f_sip_digest_gen_Authorization(valueof(wwwAuthenticate), |
| 500 | g_pars.user, g_pars.password, |
| 501 | "REGISTER", |
| 502 | f_sip_SipUrl_to_str(g_pars.registrar_sip_record.addr.nameAddr.addrSpec)) |
| 503 | */ |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 504 | authorization := f_tr_Authorization_AKAv1MD5(valueof(wwwAuthenticate), |
| 505 | g_pars.user & "@" & g_pars.realm, |
| 506 | f_sip_SipUrl_to_str(g_pars.registrar_sip_record.addr.nameAddr.addrSpec)); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 507 | /* TODO: match Authorization from above: */ |
| 508 | exp_req := |
| 509 | tr_SIP_REGISTER(g_pars.registrar_sip_req_uri, |
| 510 | ?, |
| 511 | tr_SipAddr(), |
| 512 | tr_SipAddr(), |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 513 | tr_Via_from(?), |
| 514 | authorization := authorization); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 515 | SIP.receive(exp_req) -> value g_rx_sip_req; |
| 516 | |
| 517 | sip_call_id := g_rx_sip_req.msgHeader.callId.callid; |
| 518 | via := g_rx_sip_req.msgHeader.via; |
| 519 | from_addr := ts_SipAddr_from_Addr_Union(g_rx_sip_req.msgHeader.fromField.addressField, |
| 520 | g_rx_sip_req.msgHeader.fromField.fromParams); |
| 521 | to_addr := ts_SipAddr_from_Addr_Union(g_rx_sip_req.msgHeader.toField.addressField, |
| 522 | g_rx_sip_req.msgHeader.toField.toParams); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 523 | sip_seq_nr := g_rx_sip_req.msgHeader.cSeq.seqNumber; |
| 524 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 525 | /* Tx 100 Trying */ |
| 526 | tx_resp := ts_SIP_Response_Trying(sip_call_id, |
| 527 | from_addr, |
| 528 | to_addr, |
| 529 | via, |
| 530 | sip_seq_nr, |
| 531 | "REGISTER", |
| 532 | allow := omit, |
| 533 | server := server_name, |
| 534 | userAgent := omit); |
| 535 | SIP.send(tx_resp); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 536 | |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame^] | 537 | /* Validate P-Access-Network-Info: */ |
| 538 | f_ims_validate_register_P_Access_Network_info(g_rx_sip_req, exp_present := true); |
| 539 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 540 | /* Tx 200 OK */ |
| 541 | to_addr.params := f_sip_param_set(to_addr.params, "tag", f_sip_rand_tag()); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 542 | tx_resp := ts_SIP_Response(sip_call_id, |
| 543 | from_addr, |
| 544 | to_addr, |
| 545 | "REGISTER", 200, |
| 546 | sip_seq_nr, |
| 547 | "OK", |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 548 | via, |
| 549 | require := require, |
| 550 | server := server_name, |
| 551 | supported := supported, |
| 552 | userAgent := omit); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 553 | SIP.send(tx_resp); |
| 554 | } |
| 555 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 556 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 557 | |
| 558 | } |
| 559 | |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 560 | } |