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 | |
Pau Espin Pedrol | 80b981a | 2024-06-04 18:37:22 +0200 | [diff] [blame^] | 59 | type record IMS_AuthVector { |
| 60 | OCT16 rand, |
| 61 | OCT16 autn, |
| 62 | OCT8 res, |
| 63 | OCT16 ck, |
| 64 | OCT16 ik |
| 65 | } |
| 66 | |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 67 | type record IMS_ConnHdlrSubscrPars { |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 68 | charstring remote_sip_host optional, |
| 69 | uint16_t remote_sip_port optional, |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 70 | charstring imsi, |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 71 | charstring display_name, |
| 72 | charstring password, |
Pau Espin Pedrol | 4e6672c | 2024-05-22 17:03:53 +0200 | [diff] [blame] | 73 | charstring msisdn, |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame] | 74 | /* Expected User-Location-Info in P-Access-Network-Info */ |
| 75 | charstring uli_str, |
Pau Espin Pedrol | 80b981a | 2024-06-04 18:37:22 +0200 | [diff] [blame^] | 76 | IMS_AuthVector auth, |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 77 | charstring ipsec_auth_key, |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 78 | integer ipsec_local_spi_c, |
| 79 | integer ipsec_local_spi_s, |
| 80 | integer ipsec_remote_spi_c optional, |
| 81 | integer ipsec_remote_spi_s optional, |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 82 | uint16_t ipsec_remote_port_c optional, |
| 83 | uint16_t ipsec_remote_port_s optional, |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 84 | SipAddr registrar_sip_record, |
| 85 | CallidString registrar_sip_call_id, |
| 86 | integer registrar_sip_seq_nr, |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 87 | SipUrl local_sip_url_ext, |
| 88 | SipAddr local_sip_record, |
| 89 | Contact local_contact, |
Pau Espin Pedrol | 586eec5 | 2024-06-04 19:07:33 +0200 | [diff] [blame] | 90 | P_Associated_Uri p_associated_uri, |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 91 | IMS_CallPars cp optional |
| 92 | } |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 93 | type record of IMS_ConnHdlrSubscrPars IMS_ConnHdlrSubscrParsList; |
| 94 | |
| 95 | |
| 96 | type record IMS_ConnHdlrPars { |
| 97 | float t_guard, |
| 98 | charstring realm, |
| 99 | charstring local_sip_host, |
| 100 | uint16_t local_sip_port, |
| 101 | SipUrl registrar_sip_req_uri, |
| 102 | Via local_via, |
| 103 | IMS_ConnHdlrSubscrPars subscr optional |
| 104 | } |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 105 | type record of IMS_ConnHdlrPars IMS_ConnHdlrParsList; |
| 106 | |
| 107 | type record IMS_CallParsMT { |
| 108 | /* Whether to wait for COORD.receive(COORD_CMD_PICKUP) before accepting the call. */ |
| 109 | boolean wait_coord_cmd_pickup, |
| 110 | /* Whether to expect CANCEL instead of ACK as answer to our OK */ |
| 111 | boolean exp_cancel |
| 112 | } |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 113 | template (value) IMS_CallParsMT t_IMS_CallParsMT := { |
| 114 | wait_coord_cmd_pickup := false, |
| 115 | exp_cancel := false |
| 116 | } |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 117 | |
| 118 | type record IMS_CallPars { |
| 119 | SipAddr calling optional, |
| 120 | SipAddr called optional, |
| 121 | |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 122 | From from_addr optional, |
| 123 | To to_addr optional, |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 124 | |
| 125 | CallidString sip_call_id, |
| 126 | integer sip_seq_nr, |
| 127 | charstring sip_body optional, |
| 128 | |
| 129 | charstring local_rtp_addr, |
| 130 | uint16_t local_rtp_port, |
| 131 | |
| 132 | SDP_Message peer_sdp optional, |
| 133 | IMS_CallParsMT mt |
| 134 | } |
| 135 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 136 | template (value) IMS_CallPars t_IMS_CallPars(charstring local_rtp_addr, |
| 137 | uint16_t local_rtp_port := 0, |
| 138 | template (omit) SipAddr calling := omit, |
| 139 | template (omit) SipAddr called := omit) := { |
| 140 | calling := calling, |
| 141 | called := called, |
| 142 | from_addr := omit, |
| 143 | to_addr := omit, |
| 144 | sip_call_id := hex2str(f_rnd_hexstring(15)), |
| 145 | sip_seq_nr := f_sip_rand_seq_nr(), |
| 146 | sip_body := omit, |
| 147 | local_rtp_addr := local_rtp_addr, |
| 148 | local_rtp_port := local_rtp_port, |
| 149 | peer_sdp := omit, |
| 150 | mt := t_IMS_CallParsMT |
| 151 | } |
| 152 | |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 153 | template (value) IMS_ConnHdlrSubscrPars t_IMS_SubscrPars(charstring local_sip_host, |
| 154 | uint16_t local_sip_port, |
Pau Espin Pedrol | f46132e | 2024-06-04 17:11:59 +0200 | [diff] [blame] | 155 | charstring domain, |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 156 | charstring imsi, |
| 157 | charstring msisdn := "90828", |
| 158 | charstring display_name := "Anonymous", |
| 159 | charstring password := "secret", |
| 160 | template (omit) IMS_CallPars cp := omit) := { |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 161 | remote_sip_host := omit, |
| 162 | remote_sip_port := omit, |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 163 | imsi := imsi, |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 164 | display_name := f_sip_str_quote(display_name), |
| 165 | password := password, |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 166 | msisdn := msisdn, |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame] | 167 | uli_str := "2380100010000101", |
Pau Espin Pedrol | 80b981a | 2024-06-04 18:37:22 +0200 | [diff] [blame^] | 168 | auth := { |
| 169 | /* The Nonce field is the Base64 encoded version of the RAND value and concatenated with the AUTN: */ |
| 170 | rand := 'd5d5de2bce418d7865ed7fa6956618a2'O, |
| 171 | autn := 'd42e61db5f15800067393a5b7691a227'O, |
| 172 | res := '6f2556bbe4366ab1'O, |
| 173 | ck := '0b389d08c833991734936bec55cac800'O, |
| 174 | ik := '17141862125bd30c81c4224391a0909a'O |
| 175 | }, |
| 176 | ipsec_auth_key := "0x17141862125bd30c81c4224391a0909a00000000", |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 177 | ipsec_local_spi_c := 4142, |
| 178 | ipsec_local_spi_s := 4143, |
| 179 | ipsec_remote_spi_c := omit, |
| 180 | ipsec_remote_spi_s := omit, |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 181 | ipsec_remote_port_c := omit, |
| 182 | ipsec_remote_port_s := omit, |
Pau Espin Pedrol | f46132e | 2024-06-04 17:11:59 +0200 | [diff] [blame] | 183 | registrar_sip_record := ts_SipAddr(ts_HostPort(domain), |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 184 | ts_UserInfo(imsi), |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 185 | f_sip_str_quote(display_name)), |
Pau Espin Pedrol | f46132e | 2024-06-04 17:11:59 +0200 | [diff] [blame] | 186 | registrar_sip_call_id := hex2str(f_rnd_hexstring(15)) & "@" & domain, |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 187 | registrar_sip_seq_nr := f_sip_rand_seq_nr(), |
Pau Espin Pedrol | f46132e | 2024-06-04 17:11:59 +0200 | [diff] [blame] | 188 | local_sip_url_ext := ts_SipUrl(ts_HostPort(domain, local_sip_port), |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 189 | ts_UserInfo(imsi)), |
Pau Espin Pedrol | f46132e | 2024-06-04 17:11:59 +0200 | [diff] [blame] | 190 | local_sip_record := ts_SipAddr(ts_HostPort(domain), |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 191 | ts_UserInfo(imsi)), |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 192 | local_contact := valueof(ts_Contact({ |
| 193 | ts_ContactAddress( |
| 194 | ts_Addr_Union_SipUrl(ts_SipUrl(ts_HostPort( |
Pau Espin Pedrol | f46132e | 2024-06-04 17:11:59 +0200 | [diff] [blame] | 195 | domain, |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 196 | local_sip_port), |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 197 | ts_UserInfo(imsi))), |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 198 | omit) |
| 199 | })), |
Pau Espin Pedrol | 586eec5 | 2024-06-04 19:07:33 +0200 | [diff] [blame] | 200 | p_associated_uri := ts_P_Associated_Uri({}), |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 201 | cp := cp |
| 202 | } |
| 203 | |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 204 | template (value) IMS_ConnHdlrPars t_IMS_Pars(charstring local_sip_host, |
| 205 | uint16_t local_sip_port, |
Pau Espin Pedrol | f46132e | 2024-06-04 17:11:59 +0200 | [diff] [blame] | 206 | charstring domain, |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 207 | charstring imsi, |
| 208 | template (omit) IMS_CallPars cp := omit) := { |
| 209 | t_guard := 30.0, |
Pau Espin Pedrol | f46132e | 2024-06-04 17:11:59 +0200 | [diff] [blame] | 210 | realm := domain, |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 211 | local_sip_host := local_sip_host, |
| 212 | local_sip_port := local_sip_port, |
Pau Espin Pedrol | f46132e | 2024-06-04 17:11:59 +0200 | [diff] [blame] | 213 | registrar_sip_req_uri := valueof(ts_SipUrlHost(domain)), |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 214 | local_via := ts_Via_from(ts_HostPort(local_sip_host, local_sip_port)), |
Pau Espin Pedrol | f46132e | 2024-06-04 17:11:59 +0200 | [diff] [blame] | 215 | subscr := t_IMS_SubscrPars(local_sip_host, local_sip_port, domain := domain, imsi := imsi, cp := cp) |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 216 | } |
| 217 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 218 | private altstep as_Tguard() runs on IMS_ConnHdlr { |
| 219 | [] g_Tguard.timeout { |
| 220 | setverdict(fail, "Tguard timeout"); |
| 221 | mtc.stop; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | type function ims_void_fn(charstring id) runs on IMS_ConnHdlr; |
| 226 | function f_ims_handler_init(ims_void_fn fn, charstring id, IMS_ConnHdlrPars pars) |
| 227 | runs on IMS_ConnHdlr { |
| 228 | g_name := id; |
| 229 | g_pars := pars; |
| 230 | g_Tguard.start(pars.t_guard); |
| 231 | activate(as_Tguard()); |
| 232 | |
| 233 | /* call the user-supied test case function */ |
| 234 | fn.apply(id); |
| 235 | } |
| 236 | |
| 237 | private altstep as_SIP_fail_req(charstring exp_msg_str := "") runs on IMS_ConnHdlr |
| 238 | { |
| 239 | var PDU_SIP_Request sip_req; |
| 240 | [] SIP.receive(PDU_SIP_Request:?) -> value sip_req { |
| 241 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 242 | log2str(g_name & ": Received unexpected SIP Req message := ", sip_req, "\nvs exp := ", exp_msg_str)); |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | private altstep as_SIP_fail_resp(charstring exp_msg_str := "") runs on IMS_ConnHdlr |
| 247 | { |
| 248 | var PDU_SIP_Response sip_resp; |
| 249 | [] SIP.receive(PDU_SIP_Response:?) -> value sip_resp { |
| 250 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 251 | log2str(g_name & ": Received unexpected SIP Resp message := ", sip_resp, "\nvs exp := ", exp_msg_str)); |
| 252 | } |
| 253 | } |
| 254 | |
Pau Espin Pedrol | 717379f | 2024-05-17 18:36:51 +0200 | [diff] [blame] | 255 | private function f_nonce_from_rand_autn(octetstring rand, octetstring autn) return charstring { |
| 256 | var octetstring concat := rand & autn; |
| 257 | var charstring nonce := enc_MIME_Base64(concat); |
| 258 | log("rand=", rand, " & autn=",autn, " => nonce=", nonce); |
| 259 | return nonce; |
| 260 | } |
| 261 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 262 | /* HTTP Digest Authentication Using AKA (AKAv1-MD5): RFC 3310 */ |
| 263 | function f_tr_Authorization_AKAv1MD5(WwwAuthenticate www_authenticate, |
| 264 | charstring username, |
Pau Espin Pedrol | 80b981a | 2024-06-04 18:37:22 +0200 | [diff] [blame^] | 265 | charstring uri) |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 266 | return template (present) Authorization { |
| 267 | var CommaParam_List digestCln; |
| 268 | var template (present) Authorization authorization; |
| 269 | var template (present) Credentials cred; |
| 270 | var template (omit) GenericParam rx_param; |
| 271 | |
| 272 | digestCln := www_authenticate.challenge[0].digestCln; |
| 273 | |
| 274 | var charstring algorithm := f_sip_param_get_value_present_or_fail(digestCln, "algorithm"); |
| 275 | var charstring realm := f_sip_param_get_value_present_or_fail(digestCln, "realm"); |
| 276 | var charstring nonce := f_sip_param_get_value_present_or_fail(digestCln, "nonce"); |
| 277 | |
| 278 | var template (present) CommaParam_List digestResponse := superset( |
| 279 | tr_Param("username", f_sip_str_quote(username)), |
| 280 | tr_Param("realm", f_sip_str_quote(realm)), |
| 281 | tr_Param("nonce", f_sip_str_quote(nonce)), |
| 282 | tr_Param("uri", f_sip_str_quote(uri)), |
| 283 | tr_Param("response", ?), |
| 284 | tr_Param("algorithm", algorithm), |
| 285 | tr_Param("qop", "auth"), |
| 286 | tr_Param("cnonce", ?), |
| 287 | tr_Param("nc", ?) |
| 288 | ); |
| 289 | cred := tr_Credentials_DigestResponse(digestResponse); |
| 290 | authorization := tr_Authorization(cred); |
| 291 | return authorization; |
| 292 | } |
| 293 | |
Pau Espin Pedrol | 80b981a | 2024-06-04 18:37:22 +0200 | [diff] [blame^] | 294 | private function f_ims_validate_Authorization_AKAv1MD5_Response(Authorization authorization, charstring method) |
| 295 | runs on IMS_ConnHdlr { |
| 296 | f_sip_digest_validate_Authorization_AKAv1MD5(authorization, method, g_pars.subscr.auth.res); |
| 297 | } |
| 298 | |
| 299 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 300 | private function f_ims_validate_register_contact(Contact rx_contact) |
| 301 | { |
| 302 | /* IMS contact shows up like this: |
| 303 | * 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>" |
| 304 | */ |
| 305 | /* TODO: "that the UE must include the IMS Communication Service Identifier (ICSI) |
| 306 | in the contact: header to indicate IMS Multimedia Telephony." */ |
| 307 | /* TODO: "The UE must include an IMEI URN in the +sip.instance header field |
| 308 | parameter of the contact: header." */ |
| 309 | /* TODO: "If the UE supports SMS over IP, it must include the feature tag |
| 310 | “+g.3gpp.smsip” in the contact: header." */ |
| 311 | /* TODO: "If the UE supports conversational audio and video service, then this must |
| 312 | be indicated by adding a “video” media feature tag to the contact: header." */ |
| 313 | } |
| 314 | |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame] | 315 | /* Validate P-Access-Network-Info: RFC7315 6.4 */ |
| 316 | private function f_ims_validate_register_P_Access_Network_info(PDU_SIP_Request req, |
| 317 | boolean exp_present := true) runs on IMS_ConnHdlr |
| 318 | |
| 319 | { |
| 320 | if (not exp_present) { |
| 321 | if (ispresent(g_rx_sip_req.msgHeader.p_access_network_info)) { |
| 322 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 323 | log2str(g_name & ": Received unexpected [rfc7315 6.4] P-Access-Info := ", |
| 324 | g_rx_sip_req.msgHeader.p_access_network_info)); |
| 325 | } |
| 326 | return; |
| 327 | } |
| 328 | |
| 329 | /* exp_present: */ |
| 330 | var template (present) P_Access_Network_Info expl_tmpl := |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 331 | tr_P_Access_Network_Info({ tr_Access_net_spec_EUTRAN(g_pars.subscr.uli_str) }); |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame] | 332 | |
| 333 | if (not ispresent(g_rx_sip_req.msgHeader.p_access_network_info)) { |
| 334 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 335 | log2str(g_name & ": Received no P-Access-Info vs exp := ", |
| 336 | expl_tmpl)); |
| 337 | } |
| 338 | if (not match(g_rx_sip_req.msgHeader.p_access_network_info, expl_tmpl)) { |
| 339 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 340 | log2str(g_name & ": Received unexpected P-Access-Info := ", |
| 341 | g_rx_sip_req.msgHeader.p_access_network_info, |
| 342 | "\nvs exp := ", expl_tmpl)); |
| 343 | } |
| 344 | } |
| 345 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 346 | private function f_ims_parse_security_client(Security_client security_client) runs on IMS_ConnHdlr |
| 347 | { |
| 348 | var boolean found := false; |
| 349 | for (var integer i := 0; i < lengthof(security_client.sec_mechanism_list); i := i + 1) { |
| 350 | var Security_mechanism sec_mec := security_client.sec_mechanism_list[i]; |
| 351 | if (sec_mec.mechanism_name != "ipsec-3gpp") { |
| 352 | log("Skipping Security Mechansim: ", sec_mec.mechanism_name); |
| 353 | continue; |
| 354 | } |
| 355 | var SemicolonParam_List sec_pars := sec_mec.mechanism_params; |
| 356 | var charstring par_val; |
| 357 | par_val := f_sip_param_get_value_present_or_fail(sec_pars, "alg"); |
| 358 | if (par_val != "hmac-sha-1-96") { |
| 359 | log("Skipping Security Mechansim Algo: ", par_val); |
| 360 | continue; |
| 361 | } |
| 362 | par_val := f_sip_param_get_value_present_or_fail(sec_pars, "spi-c"); |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 363 | g_pars.subscr.ipsec_remote_spi_c := str2int(par_val); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 364 | par_val := f_sip_param_get_value_present_or_fail(sec_pars, "spi-s"); |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 365 | g_pars.subscr.ipsec_remote_spi_s := str2int(par_val); |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 366 | par_val := f_sip_param_get_value_present_or_fail(sec_pars, "port-c"); |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 367 | g_pars.subscr.ipsec_remote_port_c := str2int(par_val); |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 368 | par_val := f_sip_param_get_value_present_or_fail(sec_pars, "port-s"); |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 369 | g_pars.subscr.ipsec_remote_port_s := str2int(par_val); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 370 | found := true; |
| 371 | break; |
| 372 | } |
| 373 | |
| 374 | if (not found) { |
| 375 | Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, |
| 376 | log2str(g_name & "alg=hmac-sha-1-96 not found: ", security_client)); |
| 377 | } |
| 378 | |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 379 | log("ipsec: remote_spi_c=", g_pars.subscr.ipsec_remote_spi_c, " remote_spi_s=", g_pars.subscr.ipsec_remote_spi_s, |
| 380 | "local_spi_c=", g_pars.subscr.ipsec_local_spi_c, " local_spi_s=", g_pars.subscr.ipsec_local_spi_s); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 381 | } |
| 382 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 383 | private function f_IMS_exec_sync(charstring cmdline, template (present) integer rc := 0) |
| 384 | runs on IMS_ConnHdlr return ASP_PResult { |
| 385 | var ASP_PResult res; |
| 386 | |
| 387 | map(self:PIPE, system:PIPE); |
| 388 | res := f_PIPEasp_exec_sync_PResult(PIPE, cmdline, tr_PResult(?, ?, rc)); |
| 389 | unmap(self:PIPE, system:PIPE); |
| 390 | |
| 391 | return res; |
| 392 | } |
| 393 | |
| 394 | private function f_ims_setup_ipsec() runs on IMS_ConnHdlr |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 395 | { |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 396 | var ASP_PResult res; |
| 397 | |
| 398 | var charstring cmd := mp_ipsec_setup_script_path & " " & |
| 399 | g_pars.local_sip_host & " " & |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 400 | int2str(g_pars.local_sip_port) & " " & int2str(g_pars.subscr.ipsec_local_spi_c) & " " & |
| 401 | int2str(g_pars.local_sip_port) & " " & int2str(g_pars.subscr.ipsec_local_spi_s) & " " & |
| 402 | g_pars.subscr.remote_sip_host & " " & |
| 403 | int2str(g_pars.subscr.ipsec_remote_port_c) & " " & int2str(g_pars.subscr.ipsec_remote_spi_c) & " " & |
| 404 | int2str(g_pars.subscr.ipsec_remote_port_s) & " " & int2str(g_pars.subscr.ipsec_remote_spi_s) & " " & |
| 405 | g_pars.subscr.ipsec_auth_key; |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 406 | |
| 407 | res := f_IMS_exec_sync(cmd); |
| 408 | |
| 409 | /* Debug applied rules: */ |
| 410 | /* |
| 411 | res := f_IMS_exec_sync("ip xfrm state"); |
| 412 | log("ip-xfrm-state Result-Stdout: " & res.stdout); |
| 413 | |
| 414 | res := f_IMS_exec_sync("ip xfrm policy"); |
| 415 | log("ip-xfrm-policy Result-Stdout: " & res.stdout); |
| 416 | */ |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 417 | } |
| 418 | |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 419 | private function f_tr_Via_response(Via via_req) return template (present) Via { |
| 420 | template (present) SemicolonParam_List via_resp_params := ?; |
| 421 | |
| 422 | /*via_resp_params := { |
| 423 | { id := "rport", paramValue := int2str(g_pars.subscr.remote_sip_port.subscr.remote_sip_port) }, |
| 424 | { id := "received", paramValue := g_pars.subscr.remote_sip_host } |
| 425 | }; */ |
| 426 | return tr_Via_from(via_req.viaBody[0].sentBy, |
| 427 | via_req.viaBody[0].sentProtocol.transport, |
| 428 | via_resp_params); |
| 429 | } |
| 430 | |
| 431 | private function f_tr_From(template (value) SipAddr from_req) return template (present) SipAddr { |
| 432 | return tr_SipAddr_from_val(from_req); |
| 433 | } |
| 434 | |
| 435 | private altstep as_SIP_expect_req(template (present) PDU_SIP_Request sip_expect, boolean fail_others := true) runs on IMS_ConnHdlr |
| 436 | { |
| 437 | var charstring sip_expect_str := log2str(sip_expect); |
| 438 | [] SIP.receive(sip_expect) -> value g_rx_sip_req; |
| 439 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 440 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 441 | } |
| 442 | |
| 443 | private function f_gen_sdp() runs on IMS_ConnHdlr return charstring { |
| 444 | var charstring sdp := |
| 445 | "v=0\r\n" & |
| 446 | "o=0502 2390 1824 IN IP4 " & g_pars.subscr.cp.local_rtp_addr & "\r\n" & |
| 447 | "s=Talk\r\n" & |
| 448 | "c=IN IP4 " & g_pars.subscr.cp.local_rtp_addr & "\r\n" & |
| 449 | "t=0 0\r\n" & |
| 450 | "a=rtcp-xr:rcvr-rtt=all:10000 stat-summary=loss,dup,jitt,TTL voip-metrics\r\n" & |
| 451 | "a=record:off\r\n" & |
| 452 | "m=audio " & int2str(g_pars.subscr.cp.local_rtp_port) & " RTP/AVP 8 96 97 98 0 18 99 100 101\r\n" & |
| 453 | "a=rtpmap:8 PCMA/8000\r\n" & |
| 454 | "a=rtpmap:96 opus/48000/2\r\n" & |
| 455 | "a=fmtp:96 useinbandfec=1\r\n" & |
| 456 | "a=rtpmap:97 speex/16000\r\n" & |
| 457 | "a=fmtp:97 vbr=on\r\n" & |
| 458 | "a=rtpmap:98 speex/8000\r\n" & |
| 459 | "a=fmtp:98 vbr=on\r\n" & |
| 460 | "a=fmtp:18 annexb=yes\r\n" & |
| 461 | "a=rtpmap:99 telephone-event/48000\r\n" & |
| 462 | "a=rtpmap:100 telephone-event/16000\r\n" & |
| 463 | "a=rtpmap:101 telephone-event/8000\r\n" & |
| 464 | "a=rtcp:" & int2str(g_pars.subscr.cp.local_rtp_port + 1) & "\r\n" & |
| 465 | "a=rtcp-fb:* trr-int 1000\r\n" & |
| 466 | "a=rtcp-fb:* ccm tmmbr\r\n"; |
| 467 | return sdp; |
| 468 | } |
| 469 | |
Pau Espin Pedrol | 586eec5 | 2024-06-04 19:07:33 +0200 | [diff] [blame] | 470 | /* Peer is issuing 1st register, accept it: */ |
| 471 | altstep as_IMS_register(boolean fail_others := true) runs on IMS_ConnHdlr |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 472 | { |
| 473 | var template (present) PDU_SIP_Request exp_req := |
| 474 | tr_SIP_REGISTER(g_pars.registrar_sip_req_uri, |
| 475 | ?, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 476 | tr_From(), |
| 477 | tr_To(), |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 478 | tr_Via_from(?), |
| 479 | require := tr_Require(superset("sec-agree")), |
| 480 | security_client := tr_Security_client(superset(tr_Security_mechanism("ipsec-3gpp", |
| 481 | superset(tr_Param("alg","hmac-sha-1-96"))))), |
| 482 | supported := tr_Supported(superset("path", "sec-agree"))); |
| 483 | var charstring sip_expect_str := log2str(exp_req); |
| 484 | |
| 485 | [] SIP.receive(exp_req) -> value g_rx_sip_req { |
| 486 | var template (value) PDU_SIP_Response tx_resp; |
| 487 | var Via via; |
| 488 | var CallidString sip_call_id; |
| 489 | var Contact contact; |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 490 | var template (value) From from_addr; |
| 491 | var template (value) To to_addr; |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 492 | var template (value) CommaParam_List digestCln ; |
| 493 | var template (value) WwwAuthenticate wwwAuthenticate; |
| 494 | var template (value) Security_server security_server; |
| 495 | 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] | 496 | var template (value) Require require := ts_Require({"sec-agree"}); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 497 | var template (value) Supported supported := ts_Supported({"sec-agree"}); |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 498 | var template (present) Authorization authorization; |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 499 | var integer sip_seq_nr; |
| 500 | var charstring tx_sdp; |
| 501 | |
| 502 | sip_call_id := g_rx_sip_req.msgHeader.callId.callid; |
| 503 | via := g_rx_sip_req.msgHeader.via; |
| 504 | via.viaBody[0].viaParams := f_sip_param_set(via.viaBody[0].viaParams, "rport", "1234"); /* TODO: set remote src port of the REGISTER */ |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 505 | from_addr := g_rx_sip_req.msgHeader.fromField; |
| 506 | to_addr := g_rx_sip_req.msgHeader.toField; |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 507 | sip_seq_nr := g_rx_sip_req.msgHeader.cSeq.seqNumber; |
| 508 | |
| 509 | contact := g_rx_sip_req.msgHeader.contact; |
| 510 | f_ims_validate_register_contact(contact); |
| 511 | |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame] | 512 | /* Validate P-Access-Network-Info: rfc7315 6.4: |
| 513 | * "3GPP will use the P-Access-Network-Info header field to |
| 514 | * carry relatively sensitive information like the cell ID. Therefore, |
| 515 | * the information MUST NOT be sent outside of the 3GPP domain."" |
| 516 | * [...] "the sensitive information carried in the |
| 517 | * P-Access-Network-Info header field MUST NOT be sent in any initial |
| 518 | * unauthenticated and unprotected requests (e.g., REGISTER)." |
| 519 | */ |
| 520 | f_ims_validate_register_P_Access_Network_info(g_rx_sip_req, exp_present := false); |
| 521 | |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 522 | /* TODO: Validate "Expires" is 600000 */ |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 523 | |
| 524 | /* Tx 100 Tyring */ |
| 525 | tx_resp := ts_SIP_Response_Trying(sip_call_id, |
| 526 | from_addr, |
| 527 | to_addr, |
| 528 | via, |
| 529 | sip_seq_nr, |
| 530 | "REGISTER", |
| 531 | allow := omit, |
| 532 | server := server_name, |
| 533 | userAgent := omit); |
| 534 | SIP.send(tx_resp); |
| 535 | |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 536 | var HostPort hp := valueof(contact.contactBody.contactAddresses[0].addressField.nameAddr.addrSpec.hostPort); |
| 537 | g_pars.subscr.remote_sip_host := hp.host; |
| 538 | if (ispresent(hp.portField)) { |
| 539 | g_pars.subscr.remote_sip_port := hp.portField; |
| 540 | } else { |
| 541 | g_pars.subscr.remote_sip_port := 5060; |
| 542 | } |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 543 | f_ims_parse_security_client(g_rx_sip_req.msgHeader.security_client); |
| 544 | f_ims_setup_ipsec(); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 545 | |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 546 | to_addr.toParams := f_sip_param_set(to_addr.toParams, "tag", f_sip_rand_tag()); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 547 | |
| 548 | digestCln := { |
| 549 | ts_Param("realm", f_sip_str_quote(g_pars.realm)), |
| 550 | ts_Param("qop", f_sip_str_quote("auth")), |
| 551 | ts_Param("algorithm", "AKAv1-MD5"), |
Pau Espin Pedrol | 80b981a | 2024-06-04 18:37:22 +0200 | [diff] [blame^] | 552 | ts_Param("nonce", f_sip_str_quote(f_nonce_from_rand_autn(g_pars.subscr.auth.rand, |
| 553 | g_pars.subscr.auth.autn))) |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 554 | /* "opaque not needed in IMS "*/ |
| 555 | }; |
| 556 | wwwAuthenticate := ts_WwwAuthenticate( { ts_Challenge_digestCln(digestCln) } ) |
| 557 | |
| 558 | /* 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 */ |
| 559 | var template (value) SemicolonParam_List sec_params := { |
| 560 | ts_Param("q", "0.1"), |
| 561 | ts_Param("prot", "esp"), |
| 562 | ts_Param("mod", "trans"), |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 563 | ts_Param("spi-c", int2str(g_pars.subscr.ipsec_local_spi_c)), |
| 564 | ts_Param("spi-s", int2str(g_pars.subscr.ipsec_local_spi_s)), |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 565 | ts_Param("port-c", int2str(g_pars.local_sip_port)), |
| 566 | ts_Param("port-s", int2str(g_pars.local_sip_port)), |
| 567 | ts_Param("alg", "hmac-sha-1-96"), |
| 568 | ts_Param("ealg", "null") |
| 569 | }; |
| 570 | security_server := ts_Security_server({ |
| 571 | ts_Security_mechanism("ipsec-3gpp", sec_params) |
| 572 | }); |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 573 | |
| 574 | /* Tx 401 Unauthorized */ |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 575 | tx_resp := ts_SIP_Response_Unauthorized(sip_call_id, |
| 576 | from_addr, |
| 577 | to_addr, |
| 578 | via, |
| 579 | wwwAuthenticate, |
| 580 | sip_seq_nr, |
| 581 | "REGISTER", |
Pau Espin Pedrol | 586eec5 | 2024-06-04 19:07:33 +0200 | [diff] [blame] | 582 | p_associated_uri := g_pars.subscr.p_associated_uri, |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 583 | security_server := security_server, |
| 584 | server := server_name, |
| 585 | supported := supported, |
| 586 | userAgent := omit); |
| 587 | SIP.send(tx_resp); |
| 588 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 589 | /* Now we should receive a new REGISTER over ipsec: */ |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 590 | authorization := f_tr_Authorization_AKAv1MD5(valueof(wwwAuthenticate), |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 591 | g_pars.subscr.imsi & "@" & g_pars.realm, |
Pau Espin Pedrol | b0dbf7a | 2024-05-22 18:12:15 +0200 | [diff] [blame] | 592 | f_sip_SipUrl_to_str(g_pars.registrar_sip_req_uri)); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 593 | exp_req := |
| 594 | tr_SIP_REGISTER(g_pars.registrar_sip_req_uri, |
| 595 | ?, |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 596 | tr_From(), |
| 597 | tr_To(), |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 598 | tr_Via_from(?), |
| 599 | authorization := authorization); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 600 | SIP.receive(exp_req) -> value g_rx_sip_req; |
| 601 | |
| 602 | sip_call_id := g_rx_sip_req.msgHeader.callId.callid; |
| 603 | via := g_rx_sip_req.msgHeader.via; |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 604 | from_addr := g_rx_sip_req.msgHeader.fromField; |
| 605 | to_addr := g_rx_sip_req.msgHeader.toField; |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 606 | sip_seq_nr := g_rx_sip_req.msgHeader.cSeq.seqNumber; |
| 607 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 608 | /* Tx 100 Trying */ |
| 609 | tx_resp := ts_SIP_Response_Trying(sip_call_id, |
| 610 | from_addr, |
| 611 | to_addr, |
| 612 | via, |
| 613 | sip_seq_nr, |
| 614 | "REGISTER", |
| 615 | allow := omit, |
| 616 | server := server_name, |
| 617 | userAgent := omit); |
| 618 | SIP.send(tx_resp); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 619 | |
Pau Espin Pedrol | 80b981a | 2024-06-04 18:37:22 +0200 | [diff] [blame^] | 620 | /* Validate Digest Response: */ |
| 621 | f_ims_validate_Authorization_AKAv1MD5_Response(g_rx_sip_req.msgHeader.authorization, "REGISTER"); |
| 622 | |
Pau Espin Pedrol | 0c5c647 | 2024-05-21 13:13:49 +0200 | [diff] [blame] | 623 | /* Validate P-Access-Network-Info: */ |
| 624 | f_ims_validate_register_P_Access_Network_info(g_rx_sip_req, exp_present := true); |
| 625 | |
Pau Espin Pedrol | 586eec5 | 2024-06-04 19:07:33 +0200 | [diff] [blame] | 626 | g_pars.subscr.p_associated_uri := valueof(ts_P_Associated_Uri({ |
Pau Espin Pedrol | 4e6672c | 2024-05-22 17:03:53 +0200 | [diff] [blame] | 627 | ts_P_Assoc_uri_spec(ts_NameAddr(ts_SipUrl(ts_HostPort(g_pars.realm), |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 628 | ts_UserInfo(g_pars.subscr.msisdn), |
Pau Espin Pedrol | 4e6672c | 2024-05-22 17:03:53 +0200 | [diff] [blame] | 629 | scheme := "sip"))), |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 630 | ts_P_Assoc_uri_spec(ts_NameAddr(ts_SipUrl(ts_HostPort(g_pars.subscr.msisdn), |
Pau Espin Pedrol | 4e6672c | 2024-05-22 17:03:53 +0200 | [diff] [blame] | 631 | omit, |
| 632 | scheme := "tel"))), |
| 633 | ts_P_Assoc_uri_spec(g_rx_sip_req.msgHeader.toField.addressField.nameAddr) |
Pau Espin Pedrol | 586eec5 | 2024-06-04 19:07:33 +0200 | [diff] [blame] | 634 | })); |
Pau Espin Pedrol | 4e6672c | 2024-05-22 17:03:53 +0200 | [diff] [blame] | 635 | |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 636 | /* Tx 200 OK */ |
Pau Espin Pedrol | 41b0e07 | 2024-05-29 18:25:51 +0200 | [diff] [blame] | 637 | to_addr.toParams := f_sip_param_set(to_addr.toParams, "tag", f_sip_rand_tag()); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 638 | tx_resp := ts_SIP_Response(sip_call_id, |
| 639 | from_addr, |
| 640 | to_addr, |
| 641 | "REGISTER", 200, |
| 642 | sip_seq_nr, |
| 643 | "OK", |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 644 | via, |
Pau Espin Pedrol | 586eec5 | 2024-06-04 19:07:33 +0200 | [diff] [blame] | 645 | p_associated_uri := g_pars.subscr.p_associated_uri, |
Pau Espin Pedrol | a674d61 | 2024-05-14 19:56:33 +0200 | [diff] [blame] | 646 | require := require, |
| 647 | server := server_name, |
| 648 | supported := supported, |
| 649 | userAgent := omit); |
Pau Espin Pedrol | a2812ec | 2024-05-10 20:30:44 +0200 | [diff] [blame] | 650 | SIP.send(tx_resp); |
| 651 | } |
| 652 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 653 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 654 | |
| 655 | } |
| 656 | |
Pau Espin Pedrol | 586eec5 | 2024-06-04 19:07:33 +0200 | [diff] [blame] | 657 | /* Peer wants to unregister, accept it: */ |
| 658 | altstep as_IMS_unregister(boolean fail_others := true) runs on IMS_ConnHdlr |
| 659 | { |
| 660 | var template (present) PDU_SIP_Request exp_req := |
| 661 | tr_SIP_REGISTER(g_pars.registrar_sip_req_uri, |
| 662 | ?, |
| 663 | tr_From(), |
| 664 | tr_To(), |
| 665 | tr_Via_from(?), |
| 666 | expires := tr_Expires(int2str(0)), |
| 667 | require := tr_Require(superset("sec-agree")), |
| 668 | security_client := tr_Security_client(superset(tr_Security_mechanism("ipsec-3gpp", |
| 669 | superset(tr_Param("alg","hmac-sha-1-96"))))), |
| 670 | supported := tr_Supported(superset("path", "sec-agree"))); |
| 671 | var charstring sip_expect_str := log2str(exp_req); |
| 672 | |
| 673 | [] SIP.receive(exp_req) -> value g_rx_sip_req { |
| 674 | var template (value) PDU_SIP_Response tx_resp; |
| 675 | var Via via; |
| 676 | var CallidString sip_call_id; |
| 677 | var Contact contact; |
| 678 | var template (value) From from_addr; |
| 679 | var template (value) To to_addr; |
| 680 | var template (value) CommaParam_List digestCln ; |
| 681 | var template (value) WwwAuthenticate wwwAuthenticate; |
| 682 | var template (value) Security_server security_server; |
| 683 | var template (value) Server server_name := ts_Server({c_sip_server_name}); |
| 684 | var template (value) Require require := ts_Require({"sec-agree"}); |
| 685 | var template (value) Supported supported := ts_Supported({"sec-agree"}); |
| 686 | var template (present) Authorization authorization; |
| 687 | var integer sip_seq_nr; |
| 688 | var charstring tx_sdp; |
| 689 | |
| 690 | sip_call_id := g_rx_sip_req.msgHeader.callId.callid; |
| 691 | via := g_rx_sip_req.msgHeader.via; |
| 692 | via.viaBody[0].viaParams := f_sip_param_set(via.viaBody[0].viaParams, "rport", "1234"); /* TODO: set remote src port of the REGISTER */ |
| 693 | from_addr := g_rx_sip_req.msgHeader.fromField; |
| 694 | to_addr := g_rx_sip_req.msgHeader.toField; |
| 695 | sip_seq_nr := g_rx_sip_req.msgHeader.cSeq.seqNumber; |
| 696 | |
| 697 | contact := g_rx_sip_req.msgHeader.contact; |
| 698 | f_ims_validate_register_contact(contact); |
| 699 | |
| 700 | /* Validate P-Access-Network-Info: */ |
| 701 | f_ims_validate_register_P_Access_Network_info(g_rx_sip_req, exp_present := true); |
| 702 | |
| 703 | /* Tx 100 Tyring */ |
| 704 | tx_resp := ts_SIP_Response_Trying(sip_call_id, |
| 705 | from_addr, |
| 706 | to_addr, |
| 707 | via, |
| 708 | sip_seq_nr, |
| 709 | "REGISTER", |
| 710 | allow := omit, |
| 711 | server := server_name, |
| 712 | userAgent := omit); |
| 713 | SIP.send(tx_resp); |
| 714 | |
| 715 | /* Change all Contact parameters to expires=0: */ |
| 716 | for (var integer i := 0; i < lengthof(contact.contactBody.contactAddresses); i := i + 1) { |
| 717 | contact.contactBody.contactAddresses[i].contactParams := valueof({ ts_Param("expires", "0") }); |
| 718 | } |
| 719 | /* Tx 200 OK */ |
| 720 | to_addr.toParams := f_sip_param_set(to_addr.toParams, "tag", f_sip_rand_tag()); |
| 721 | tx_resp := ts_SIP_Response(sip_call_id, |
| 722 | from_addr, |
| 723 | to_addr, |
| 724 | "REGISTER", 200, |
| 725 | sip_seq_nr, |
| 726 | "OK", |
| 727 | via, |
| 728 | contact := contact, |
| 729 | p_associated_uri := g_pars.subscr.p_associated_uri, |
| 730 | require := require, |
| 731 | server := server_name, |
| 732 | supported := supported, |
| 733 | userAgent := omit); |
| 734 | SIP.send(tx_resp); |
| 735 | } |
| 736 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 737 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 738 | } |
| 739 | |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 740 | private function f_ConnHdlr_parse_initial_SIP_INVITE(PDU_SIP_Request rx_sip_req) runs on IMS_ConnHdlr |
| 741 | { |
| 742 | f_SDP_decodeMessage(rx_sip_req.messageBody, g_pars.subscr.cp.peer_sdp); |
| 743 | log("Rx Initial MO INVITE decoded SDP: ", g_pars.subscr.cp.peer_sdp); |
| 744 | |
| 745 | /* Obtain params: */ |
| 746 | g_pars.subscr.cp.sip_call_id := rx_sip_req.msgHeader.callId.callid; |
| 747 | g_pars.subscr.cp.from_addr := rx_sip_req.msgHeader.fromField; |
| 748 | g_pars.subscr.cp.to_addr := rx_sip_req.msgHeader.toField; |
| 749 | g_pars.subscr.cp.to_addr.toParams := f_sip_param_set(g_pars.subscr.cp.to_addr.toParams, "tag", f_sip_rand_tag()); |
| 750 | g_pars.subscr.cp.sip_seq_nr := rx_sip_req.msgHeader.cSeq.seqNumber; |
| 751 | } |
| 752 | |
| 753 | /* Peer is calling us, accept it: */ |
| 754 | altstep as_IMS_mo_call_accept(boolean exp_update_to_direct_rtp := false, |
| 755 | boolean fail_others := true) runs on IMS_ConnHdlr |
| 756 | { |
| 757 | var template (present) PDU_SIP_Request exp_req := |
| 758 | tr_SIP_INVITE(f_tr_SipUrl_opt_defport(ts_SipUrl_from_Addr_Union(g_pars.subscr.cp.called.addr)), |
| 759 | ?, |
Pau Espin Pedrol | 0908701 | 2024-06-04 18:07:48 +0200 | [diff] [blame] | 760 | tr_From(tr_Addr_Union_from_val(g_pars.subscr.cp.calling.addr), *), |
Pau Espin Pedrol | 901cede | 2024-05-30 13:03:42 +0200 | [diff] [blame] | 761 | tr_To(tr_Addr_Union_from_val(g_pars.subscr.cp.called.addr), *), |
| 762 | tr_Via_from(f_tr_HostPort(g_pars.subscr.remote_sip_host, g_pars.subscr.remote_sip_port)), |
| 763 | ?, ?); |
| 764 | var charstring sip_expect_str := log2str(exp_req); |
| 765 | |
| 766 | [] SIP.receive(exp_req) -> value g_rx_sip_req { |
| 767 | var template (value) PDU_SIP_Response tx_resp; |
| 768 | var Via via; |
| 769 | var charstring tx_sdp; |
| 770 | |
| 771 | /* Obtain params: */ |
| 772 | f_ConnHdlr_parse_initial_SIP_INVITE(g_rx_sip_req); |
| 773 | via := g_rx_sip_req.msgHeader.via; |
| 774 | |
| 775 | |
| 776 | /* Tx 180 Ringing */ |
| 777 | tx_resp := ts_SIP_Response_Ringing(g_pars.subscr.cp.sip_call_id, |
| 778 | g_pars.subscr.cp.from_addr, |
| 779 | g_pars.subscr.cp.to_addr, |
| 780 | via, |
| 781 | g_pars.subscr.cp.sip_seq_nr); |
| 782 | SIP.send(tx_resp); |
| 783 | |
| 784 | /* Tx 200 OK */ |
| 785 | tx_sdp := f_gen_sdp(); |
| 786 | tx_resp := ts_SIP_Response(g_pars.subscr.cp.sip_call_id, |
| 787 | g_pars.subscr.cp.from_addr, |
| 788 | g_pars.subscr.cp.to_addr, |
| 789 | "INVITE", 200, |
| 790 | g_pars.subscr.cp.sip_seq_nr, |
| 791 | "OK", |
| 792 | via, |
| 793 | body := tx_sdp); |
| 794 | SIP.send(tx_resp); |
| 795 | |
| 796 | /* Wait for ACK */ |
| 797 | exp_req := tr_SIP_ACK(f_tr_SipUrl_opt_defport(ts_SipUrl_from_Addr_Union(g_pars.subscr.cp.called.addr)), |
| 798 | g_pars.subscr.cp.sip_call_id, |
| 799 | g_pars.subscr.cp.from_addr, |
| 800 | g_pars.subscr.cp.to_addr, |
| 801 | f_tr_Via_response(via), |
| 802 | g_pars.subscr.cp.sip_seq_nr, *); |
| 803 | as_SIP_expect_req(exp_req); |
| 804 | } |
| 805 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 806 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 807 | |
| 808 | } |
| 809 | |
| 810 | /* Call is terminated by peer: */ |
| 811 | altstep as_IMS_exp_call_hangup(template (present) integer exp_seq_nr := ?, boolean fail_others := true) runs on IMS_ConnHdlr |
| 812 | { |
| 813 | var template (present) PDU_SIP_Request exp_req := |
| 814 | tr_SIP_BYE(f_tr_SipUrl_opt_defport(ts_SipUrl_from_Addr_Union(g_pars.subscr.cp.called.addr)), |
| 815 | g_pars.subscr.cp.sip_call_id, |
| 816 | g_pars.subscr.cp.from_addr, |
| 817 | g_pars.subscr.cp.to_addr, |
| 818 | tr_Via_from(f_tr_HostPort(g_pars.subscr.remote_sip_host, g_pars.subscr.remote_sip_port)), |
| 819 | exp_seq_nr); |
| 820 | var charstring sip_expect_str := log2str(exp_req); |
| 821 | |
| 822 | [] SIP.receive(exp_req) -> value g_rx_sip_req { |
| 823 | var template (value) PDU_SIP_Response tx_resp; |
| 824 | var charstring tx_sdp; |
| 825 | var Via via; |
| 826 | |
| 827 | /* Update parameters: */ |
| 828 | g_pars.subscr.cp.sip_seq_nr := g_rx_sip_req.msgHeader.cSeq.seqNumber; |
| 829 | /* "branch" has changed: */ |
| 830 | via := g_rx_sip_req.msgHeader.via; |
| 831 | |
| 832 | /* Tx 200 OK */ |
| 833 | tx_sdp := f_gen_sdp(); |
| 834 | tx_resp := ts_SIP_Response(g_pars.subscr.cp.sip_call_id, |
| 835 | g_pars.subscr.cp.from_addr, |
| 836 | g_pars.subscr.cp.to_addr, |
| 837 | "BYE", 200, |
| 838 | g_pars.subscr.cp.sip_seq_nr, |
| 839 | "OK", |
| 840 | via, |
| 841 | body := tx_sdp); |
| 842 | SIP.send(tx_resp); |
| 843 | } |
| 844 | [fail_others] as_SIP_fail_resp(sip_expect_str); |
| 845 | [fail_others] as_SIP_fail_req(sip_expect_str); |
| 846 | } |
| 847 | |
Pau Espin Pedrol | ac8a054 | 2024-04-19 17:30:57 +0200 | [diff] [blame] | 848 | } |