src/rsn_supp/wpa_ie.c

   1 /*
   2  * wpa_supplicant - WPA/RSN IE and KDE processing
   3  * Copyright (c) 2003-2018, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "wpa.h"
  13 #include "pmksa_cache.h"
  14 #include "common/ieee802_11_defs.h"
  15 #include "wpa_i.h"
  16 #include "wpa_ie.h"
  17
  18
  19 /**
  20  * wpa_parse_wpa_ie - Parse WPA/RSN IE
  21  * @wpa_ie: Pointer to WPA or RSN IE
  22  * @wpa_ie_len: Length of the WPA/RSN IE
  23  * @data: Pointer to data area for parsing results
  24  * Returns: 0 on success, -1 on failure
  25  *
  26  * Parse the contents of WPA or RSN IE and write the parsed data into data.
  27  */
  28 int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len,
  29                      struct wpa_ie_data *data)
  30 {
  31         if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN)
  32                 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
  33         if (wpa_ie_len >= 6 && wpa_ie[0] == WLAN_EID_VENDOR_SPECIFIC &&
  34             wpa_ie[1] >= 4 && WPA_GET_BE32(&wpa_ie[2]) == OSEN_IE_VENDOR_TYPE)
  35                 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
  36         else
  37                 return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
  38 }
  39
  40
  41 static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
  42                               int pairwise_cipher, int group_cipher,
  43                               int key_mgmt)
  44 {
  45         u8 *pos;
  46         struct wpa_ie_hdr *hdr;
  47         u32 suite;
  48
  49         if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
  50             2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
  51                 return -1;
  52
  53         hdr = (struct wpa_ie_hdr *) wpa_ie;
  54         hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
  55         RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
  56         WPA_PUT_LE16(hdr->version, WPA_VERSION);
  57         pos = (u8 *) (hdr + 1);
  58
  59         suite = wpa_cipher_to_suite(WPA_PROTO_WPA, group_cipher);
  60         if (suite == 0) {
  61                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
  62                            group_cipher);
  63                 return -1;
  64         }
  65         RSN_SELECTOR_PUT(pos, suite);
  66         pos += WPA_SELECTOR_LEN;
  67
  68         *pos++ = 1;
  69         *pos++ = 0;
  70         suite = wpa_cipher_to_suite(WPA_PROTO_WPA, pairwise_cipher);
  71         if (suite == 0 ||
  72             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
  73              pairwise_cipher != WPA_CIPHER_NONE)) {
  74                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
  75                            pairwise_cipher);
  76                 return -1;
  77         }
  78         RSN_SELECTOR_PUT(pos, suite);
  79         pos += WPA_SELECTOR_LEN;
  80
  81         *pos++ = 1;
  82         *pos++ = 0;
  83         if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
  84                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
  85         } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
  86                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
  87         } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
  88                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
  89         } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
  90                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_CCKM);
  91         } else {
  92                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
  93                            key_mgmt);
  94                 return -1;
  95         }
  96         pos += WPA_SELECTOR_LEN;
  97
  98         /* WPA Capabilities; use defaults, so no need to include it */
  99
 100         hdr->len = (pos - wpa_ie) - 2;
 101
 102         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 103
 104         return pos - wpa_ie;
 105 }
 106
 107
 108 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
 109                               int pairwise_cipher, int group_cipher,
 110                               int key_mgmt, int mgmt_group_cipher,
 111                               struct wpa_sm *sm)
 112 {
 113         u8 *pos;
 114         struct rsn_ie_hdr *hdr;
 115         u16 capab;
 116         u32 suite;
 117
 118         if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
 119             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
 120             (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
 121                 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
 122                            (unsigned long) rsn_ie_len);
 123                 return -1;
 124         }
 125
 126         hdr = (struct rsn_ie_hdr *) rsn_ie;
 127         hdr->elem_id = WLAN_EID_RSN;
 128         WPA_PUT_LE16(hdr->version, RSN_VERSION);
 129         pos = (u8 *) (hdr + 1);
 130
 131         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
 132         if (suite == 0) {
 133                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 134                            group_cipher);
 135                 return -1;
 136         }
 137         RSN_SELECTOR_PUT(pos, suite);
 138         pos += RSN_SELECTOR_LEN;
 139
 140         *pos++ = 1;
 141         *pos++ = 0;
 142         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
 143         if (suite == 0 ||
 144             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
 145              pairwise_cipher != WPA_CIPHER_NONE)) {
 146                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 147                            pairwise_cipher);
 148                 return -1;
 149         }
 150         RSN_SELECTOR_PUT(pos, suite);
 151         pos += RSN_SELECTOR_LEN;
 152
 153         *pos++ = 1;
 154         *pos++ = 0;
 155         if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
 156                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
 157         } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
 158                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
 159         } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
 160                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_CCKM);
 161 #ifdef CONFIG_IEEE80211R
 162         } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
 163                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 164 #ifdef CONFIG_SHA384
 165         } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X_SHA384) {
 166                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X_SHA384);
 167 #endif /* CONFIG_SHA384 */
 168         } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
 169                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 170 #endif /* CONFIG_IEEE80211R */
 171         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
 172                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
 173         } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
 174                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
 175 #ifdef CONFIG_SAE
 176         } else if (key_mgmt == WPA_KEY_MGMT_SAE) {
 177                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE);
 178         } else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) {
 179                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
 180 #endif /* CONFIG_SAE */
 181         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
 182                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192);
 183         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B) {
 184                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B);
 185 #ifdef CONFIG_FILS
 186         } else if (key_mgmt & WPA_KEY_MGMT_FILS_SHA256) {
 187                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FILS_SHA256);
 188         } else if (key_mgmt & WPA_KEY_MGMT_FILS_SHA384) {
 189                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FILS_SHA384);
 190 #ifdef CONFIG_IEEE80211R
 191         } else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256) {
 192                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
 193         } else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384) {
 194                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
 195 #endif /* CONFIG_IEEE80211R */
 196 #endif /* CONFIG_FILS */
 197 #ifdef CONFIG_OWE
 198         } else if (key_mgmt & WPA_KEY_MGMT_OWE) {
 199                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OWE);
 200 #endif /* CONFIG_OWE */
 201 #ifdef CONFIG_DPP
 202         } else if (key_mgmt & WPA_KEY_MGMT_DPP) {
 203                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_DPP);
 204 #endif /* CONFIG_DPP */
 205 #ifdef CONFIG_HS20
 206         } else if (key_mgmt & WPA_KEY_MGMT_OSEN) {
 207                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
 208 #endif /* CONFIG_HS20 */
 209         } else {
 210                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
 211                            key_mgmt);
 212                 return -1;
 213         }
 214         pos += RSN_SELECTOR_LEN;
 215
 216         /* RSN Capabilities */
 217         capab = 0;
 218         if (sm->mfp)
 219                 capab |= WPA_CAPABILITY_MFPC;
 220         if (sm->mfp == 2)
 221                 capab |= WPA_CAPABILITY_MFPR;
 222         if (sm->ocv)
 223                 capab |= WPA_CAPABILITY_OCVC;
 224         if (sm->ext_key_id)
 225                 capab |= WPA_CAPABILITY_EXT_KEY_ID_FOR_UNICAST;
 226         WPA_PUT_LE16(pos, capab);
 227         pos += 2;
 228
 229         if (sm->cur_pmksa) {
 230                 /* PMKID Count (2 octets, little endian) */
 231                 *pos++ = 1;
 232                 *pos++ = 0;
 233                 /* PMKID */
 234                 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
 235                 pos += PMKID_LEN;
 236         }
 237
 238         if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) {
 239                 if (!sm->cur_pmksa) {
 240                         /* PMKID Count */
 241                         WPA_PUT_LE16(pos, 0);
 242                         pos += 2;
 243                 }
 244
 245                 /* Management Group Cipher Suite */
 246                 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 247                                                           mgmt_group_cipher));
 248                 pos += RSN_SELECTOR_LEN;
 249         }
 250
 251         hdr->len = (pos - rsn_ie) - 2;
 252
 253         WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
 254
 255         return pos - rsn_ie;
 256 }
 257
 258
 259 #ifdef CONFIG_HS20
 260 static int wpa_gen_wpa_ie_osen(u8 *wpa_ie, size_t wpa_ie_len,
 261                                int pairwise_cipher, int group_cipher,
 262                                int key_mgmt)
 263 {
 264         u8 *pos, *len;
 265         u32 suite;
 266
 267         if (wpa_ie_len < 2 + 4 + RSN_SELECTOR_LEN +
 268             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN)
 269                 return -1;
 270
 271         pos = wpa_ie;
 272         *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 273         len = pos++; /* to be filled */
 274         WPA_PUT_BE24(pos, OUI_WFA);
 275         pos += 3;
 276         *pos++ = HS20_OSEN_OUI_TYPE;
 277
 278         /* Group Data Cipher Suite */
 279         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
 280         if (suite == 0) {
 281                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 282                            group_cipher);
 283                 return -1;
 284         }
 285         RSN_SELECTOR_PUT(pos, suite);
 286         pos += RSN_SELECTOR_LEN;
 287
 288         /* Pairwise Cipher Suite Count and List */
 289         WPA_PUT_LE16(pos, 1);
 290         pos += 2;
 291         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
 292         if (suite == 0 ||
 293             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
 294              pairwise_cipher != WPA_CIPHER_NONE)) {
 295                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 296                            pairwise_cipher);
 297                 return -1;
 298         }
 299         RSN_SELECTOR_PUT(pos, suite);
 300         pos += RSN_SELECTOR_LEN;
 301
 302         /* AKM Suite Count and List */
 303         WPA_PUT_LE16(pos, 1);
 304         pos += 2;
 305         RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
 306         pos += RSN_SELECTOR_LEN;
 307
 308         *len = pos - len - 1;
 309
 310         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 311
 312         return pos - wpa_ie;
 313 }
 314 #endif /* CONFIG_HS20 */
 315
 316
 317 /**
 318  * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
 319  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 320  * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
 321  * @wpa_ie_len: Maximum length of the generated WPA/RSN IE
 322  * Returns: Length of the generated WPA/RSN IE or -1 on failure
 323  */
 324 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
 325 {
 326         if (sm->proto == WPA_PROTO_RSN)
 327                 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
 328                                           sm->pairwise_cipher,
 329                                           sm->group_cipher,
 330                                           sm->key_mgmt, sm->mgmt_group_cipher,
 331                                           sm);
 332 #ifdef CONFIG_HS20
 333         else if (sm->proto == WPA_PROTO_OSEN)
 334                 return wpa_gen_wpa_ie_osen(wpa_ie, wpa_ie_len,
 335                                            sm->pairwise_cipher,
 336                                            sm->group_cipher,
 337                                            sm->key_mgmt);
 338 #endif /* CONFIG_HS20 */
 339         else
 340                 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
 341                                           sm->pairwise_cipher,
 342                                           sm->group_cipher,
 343                                           sm->key_mgmt);
 344 }
 345
 346
 347 int wpa_gen_rsnxe(struct wpa_sm *sm, u8 *rsnxe, size_t rsnxe_len)
 348 {
 349         u8 *pos = rsnxe;
 350
 351         if (!wpa_key_mgmt_sae(sm->key_mgmt))
 352                 return 0; /* SAE not in use */
 353         if (sm->sae_pwe != 1 && sm->sae_pwe != 2)
 354                 return 0; /* no supported extended RSN capabilities */
 355
 356         if (rsnxe_len < 3)
 357                 return -1;
 358
 359         *pos++ = WLAN_EID_RSNX;
 360         *pos++ = 1;
 361         /* bits 0-3 = 0 since only one octet of Extended RSN Capabilities is
 362          * used for now */
 363         *pos++ = BIT(WLAN_RSNX_CAPAB_SAE_H2E);
 364
 365         return pos - rsnxe;
 366 }