The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 1 | /* $NetBSD: print-ah.c,v 1.4 1996/05/20 00:41:16 fvdl Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that: (1) source code distributions |
| 9 | * retain the above copyright notice and this paragraph in its entirety, (2) |
| 10 | * distributions including binary code include the above copyright notice and |
| 11 | * this paragraph in its entirety in the documentation or other materials |
| 12 | * provided with the distribution, and (3) all advertising materials mentioning |
| 13 | * features or use of this software display the following acknowledgement: |
| 14 | * ``This product includes software developed by the University of California, |
| 15 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| 16 | * the University nor the names of its contributors may be used to endorse |
| 17 | * or promote products derived from this software without specific prior |
| 18 | * written permission. |
| 19 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| 20 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| 21 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 22 | */ |
| 23 | |
| 24 | #ifndef lint |
| 25 | static const char rcsid[] _U_ = |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 26 | "@(#) $Header: /tcpdump/master/tcpdump/print-esp.c,v 1.58 2007-12-07 00:03:07 mcr Exp $ (LBL)"; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 27 | #endif |
| 28 | |
| 29 | #ifdef HAVE_CONFIG_H |
| 30 | #include "config.h" |
| 31 | #endif |
| 32 | |
| 33 | #include <string.h> |
| 34 | |
| 35 | #include <tcpdump-stdinc.h> |
| 36 | |
| 37 | #include <stdlib.h> |
| 38 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 39 | /* Any code in this file that depends on HAVE_LIBCRYPTO depends on |
| 40 | * HAVE_OPENSSL_EVP_H too. Undefining the former when the latter isn't defined |
| 41 | * is the simplest way of handling the dependency. |
| 42 | */ |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 43 | #ifdef HAVE_LIBCRYPTO |
| 44 | #ifdef HAVE_OPENSSL_EVP_H |
| 45 | #include <openssl/evp.h> |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 46 | #else |
| 47 | #undef HAVE_LIBCRYPTO |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 48 | #endif |
| 49 | #endif |
| 50 | |
| 51 | #include <stdio.h> |
| 52 | |
| 53 | #include "ip.h" |
| 54 | #include "esp.h" |
| 55 | #ifdef INET6 |
| 56 | #include "ip6.h" |
| 57 | #endif |
| 58 | |
| 59 | #include "netdissect.h" |
| 60 | #include "addrtoname.h" |
| 61 | #include "extract.h" |
| 62 | |
| 63 | #ifndef HAVE_SOCKADDR_STORAGE |
| 64 | #ifdef INET6 |
| 65 | struct sockaddr_storage { |
| 66 | union { |
| 67 | struct sockaddr_in sin; |
| 68 | struct sockaddr_in6 sin6; |
| 69 | } un; |
| 70 | }; |
| 71 | #else |
| 72 | #define sockaddr_storage sockaddr |
| 73 | #endif |
| 74 | #endif /* HAVE_SOCKADDR_STORAGE */ |
| 75 | |
| 76 | #ifdef HAVE_LIBCRYPTO |
| 77 | struct sa_list { |
| 78 | struct sa_list *next; |
| 79 | struct sockaddr_storage daddr; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 80 | u_int32_t spi; /* if == 0, then IKEv2 */ |
| 81 | int initiator; |
| 82 | u_char spii[8]; /* for IKEv2 */ |
| 83 | u_char spir[8]; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 84 | const EVP_CIPHER *evp; |
| 85 | int ivlen; |
| 86 | int authlen; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 87 | u_char authsecret[256]; |
| 88 | int authsecret_len; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 89 | u_char secret[256]; /* is that big enough for all secrets? */ |
| 90 | int secretlen; |
| 91 | }; |
| 92 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 93 | /* |
| 94 | * this will adjust ndo_packetp and ndo_snapend to new buffer! |
| 95 | */ |
| 96 | USES_APPLE_DEPRECATED_API |
| 97 | int esp_print_decrypt_buffer_by_ikev2(netdissect_options *ndo, |
| 98 | int initiator, |
| 99 | u_char spii[8], u_char spir[8], |
| 100 | u_char *buf, u_char *end) |
| 101 | { |
| 102 | struct sa_list *sa; |
| 103 | u_char *iv; |
| 104 | int len; |
| 105 | EVP_CIPHER_CTX ctx; |
| 106 | |
| 107 | /* initiator arg is any non-zero value */ |
| 108 | if(initiator) initiator=1; |
| 109 | |
| 110 | /* see if we can find the SA, and if so, decode it */ |
| 111 | for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) { |
| 112 | if (sa->spi == 0 |
| 113 | && initiator == sa->initiator |
| 114 | && memcmp(spii, sa->spii, 8) == 0 |
| 115 | && memcmp(spir, sa->spir, 8) == 0) |
| 116 | break; |
| 117 | } |
| 118 | |
| 119 | if(sa == NULL) return 0; |
| 120 | if(sa->evp == NULL) return 0; |
| 121 | |
| 122 | /* |
| 123 | * remove authenticator, and see if we still have something to |
| 124 | * work with |
| 125 | */ |
| 126 | end = end - sa->authlen; |
| 127 | iv = buf; |
| 128 | buf = buf + sa->ivlen; |
| 129 | len = end-buf; |
| 130 | |
| 131 | if(end <= buf) return 0; |
| 132 | |
| 133 | memset(&ctx, 0, sizeof(ctx)); |
| 134 | if (EVP_CipherInit(&ctx, sa->evp, sa->secret, NULL, 0) < 0) |
| 135 | (*ndo->ndo_warning)(ndo, "espkey init failed"); |
| 136 | EVP_CipherInit(&ctx, NULL, NULL, iv, 0); |
| 137 | EVP_Cipher(&ctx, buf, buf, len); |
| 138 | EVP_CIPHER_CTX_cleanup(&ctx); |
| 139 | |
| 140 | ndo->ndo_packetp = buf; |
| 141 | ndo->ndo_snapend = end; |
| 142 | |
| 143 | return 1; |
| 144 | |
| 145 | } |
| 146 | USES_APPLE_RST |
| 147 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 148 | static void esp_print_addsa(netdissect_options *ndo, |
| 149 | struct sa_list *sa, int sa_def) |
| 150 | { |
| 151 | /* copy the "sa" */ |
| 152 | |
| 153 | struct sa_list *nsa; |
| 154 | |
| 155 | nsa = (struct sa_list *)malloc(sizeof(struct sa_list)); |
| 156 | if (nsa == NULL) |
| 157 | (*ndo->ndo_error)(ndo, "ran out of memory to allocate sa structure"); |
| 158 | |
| 159 | *nsa = *sa; |
| 160 | |
| 161 | if (sa_def) |
| 162 | ndo->ndo_sa_default = nsa; |
| 163 | |
| 164 | nsa->next = ndo->ndo_sa_list_head; |
| 165 | ndo->ndo_sa_list_head = nsa; |
| 166 | } |
| 167 | |
| 168 | |
| 169 | static u_int hexdigit(netdissect_options *ndo, char hex) |
| 170 | { |
| 171 | if (hex >= '0' && hex <= '9') |
| 172 | return (hex - '0'); |
| 173 | else if (hex >= 'A' && hex <= 'F') |
| 174 | return (hex - 'A' + 10); |
| 175 | else if (hex >= 'a' && hex <= 'f') |
| 176 | return (hex - 'a' + 10); |
| 177 | else { |
| 178 | (*ndo->ndo_error)(ndo, "invalid hex digit %c in espsecret\n", hex); |
| 179 | return 0; |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | static u_int hex2byte(netdissect_options *ndo, char *hexstring) |
| 184 | { |
| 185 | u_int byte; |
| 186 | |
| 187 | byte = (hexdigit(ndo, hexstring[0]) << 4) + hexdigit(ndo, hexstring[1]); |
| 188 | return byte; |
| 189 | } |
| 190 | |
| 191 | /* |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 192 | * returns size of binary, 0 on failure. |
| 193 | */ |
| 194 | static |
| 195 | int espprint_decode_hex(netdissect_options *ndo, |
| 196 | u_char *binbuf, unsigned int binbuf_len, |
| 197 | char *hex) |
| 198 | { |
| 199 | unsigned int len; |
| 200 | int i; |
| 201 | |
| 202 | len = strlen(hex) / 2; |
| 203 | |
| 204 | if (len > binbuf_len) { |
| 205 | (*ndo->ndo_warning)(ndo, "secret is too big: %d\n", len); |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | i = 0; |
| 210 | while (hex[0] != '\0' && hex[1]!='\0') { |
| 211 | binbuf[i] = hex2byte(ndo, hex); |
| 212 | hex += 2; |
| 213 | i++; |
| 214 | } |
| 215 | |
| 216 | return i; |
| 217 | } |
| 218 | |
| 219 | /* |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 220 | * decode the form: SPINUM@IP <tab> ALGONAME:0xsecret |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 221 | */ |
| 222 | |
| 223 | USES_APPLE_DEPRECATED_API |
| 224 | static int |
| 225 | espprint_decode_encalgo(netdissect_options *ndo, |
| 226 | char *decode, struct sa_list *sa) |
| 227 | { |
| 228 | size_t i; |
| 229 | const EVP_CIPHER *evp; |
| 230 | int authlen = 0; |
| 231 | char *colon, *p; |
| 232 | |
| 233 | colon = strchr(decode, ':'); |
| 234 | if (colon == NULL) { |
| 235 | (*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode); |
| 236 | return 0; |
| 237 | } |
| 238 | *colon = '\0'; |
| 239 | |
| 240 | if (strlen(decode) > strlen("-hmac96") && |
| 241 | !strcmp(decode + strlen(decode) - strlen("-hmac96"), |
| 242 | "-hmac96")) { |
| 243 | p = strstr(decode, "-hmac96"); |
| 244 | *p = '\0'; |
| 245 | authlen = 12; |
| 246 | } |
| 247 | if (strlen(decode) > strlen("-cbc") && |
| 248 | !strcmp(decode + strlen(decode) - strlen("-cbc"), "-cbc")) { |
| 249 | p = strstr(decode, "-cbc"); |
| 250 | *p = '\0'; |
| 251 | } |
| 252 | evp = EVP_get_cipherbyname(decode); |
| 253 | |
| 254 | if (!evp) { |
| 255 | (*ndo->ndo_warning)(ndo, "failed to find cipher algo %s\n", decode); |
| 256 | sa->evp = NULL; |
| 257 | sa->authlen = 0; |
| 258 | sa->ivlen = 0; |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | sa->evp = evp; |
| 263 | sa->authlen = authlen; |
| 264 | sa->ivlen = EVP_CIPHER_iv_length(evp); |
| 265 | |
| 266 | colon++; |
| 267 | if (colon[0] == '0' && colon[1] == 'x') { |
| 268 | /* decode some hex! */ |
| 269 | |
| 270 | colon += 2; |
| 271 | sa->secretlen = espprint_decode_hex(ndo, sa->secret, sizeof(sa->secret), colon); |
| 272 | if(sa->secretlen == 0) return 0; |
| 273 | } else { |
| 274 | i = strlen(colon); |
| 275 | |
| 276 | if (i < sizeof(sa->secret)) { |
| 277 | memcpy(sa->secret, colon, i); |
| 278 | sa->secretlen = i; |
| 279 | } else { |
| 280 | memcpy(sa->secret, colon, sizeof(sa->secret)); |
| 281 | sa->secretlen = sizeof(sa->secret); |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | return 1; |
| 286 | } |
| 287 | USES_APPLE_RST |
| 288 | |
| 289 | /* |
| 290 | * for the moment, ignore the auth algorith, just hard code the authenticator |
| 291 | * length. Need to research how openssl looks up HMAC stuff. |
| 292 | */ |
| 293 | static int |
| 294 | espprint_decode_authalgo(netdissect_options *ndo, |
| 295 | char *decode, struct sa_list *sa) |
| 296 | { |
| 297 | char *colon; |
| 298 | |
| 299 | colon = strchr(decode, ':'); |
| 300 | if (colon == NULL) { |
| 301 | (*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode); |
| 302 | return 0; |
| 303 | } |
| 304 | *colon = '\0'; |
| 305 | |
| 306 | if(strcasecmp(colon,"sha1") == 0 || |
| 307 | strcasecmp(colon,"md5") == 0) { |
| 308 | sa->authlen = 12; |
| 309 | } |
| 310 | return 1; |
| 311 | } |
| 312 | |
| 313 | static void esp_print_decode_ikeline(netdissect_options *ndo, char *line, |
| 314 | const char *file, int lineno) |
| 315 | { |
| 316 | /* it's an IKEv2 secret, store it instead */ |
| 317 | struct sa_list sa1; |
| 318 | |
| 319 | char *init; |
| 320 | char *icookie, *rcookie; |
| 321 | int ilen, rlen; |
| 322 | char *authkey; |
| 323 | char *enckey; |
| 324 | |
| 325 | init = strsep(&line, " \t"); |
| 326 | icookie = strsep(&line, " \t"); |
| 327 | rcookie = strsep(&line, " \t"); |
| 328 | authkey = strsep(&line, " \t"); |
| 329 | enckey = strsep(&line, " \t"); |
| 330 | |
| 331 | /* if any fields are missing */ |
| 332 | if(!init || !icookie || !rcookie || !authkey || !enckey) { |
| 333 | (*ndo->ndo_warning)(ndo, "print_esp: failed to find all fields for ikev2 at %s:%u", |
| 334 | file, lineno); |
| 335 | |
| 336 | return; |
| 337 | } |
| 338 | |
| 339 | ilen = strlen(icookie); |
| 340 | rlen = strlen(rcookie); |
| 341 | |
| 342 | if((init[0]!='I' && init[0]!='R') |
| 343 | || icookie[0]!='0' || icookie[1]!='x' |
| 344 | || rcookie[0]!='0' || rcookie[1]!='x' |
| 345 | || ilen!=18 |
| 346 | || rlen!=18) { |
| 347 | (*ndo->ndo_warning)(ndo, "print_esp: line %s:%u improperly formatted.", |
| 348 | file, lineno); |
| 349 | |
| 350 | (*ndo->ndo_warning)(ndo, "init=%s icookie=%s(%u) rcookie=%s(%u)", |
| 351 | init, icookie, ilen, rcookie, rlen); |
| 352 | |
| 353 | return; |
| 354 | } |
| 355 | |
| 356 | sa1.spi = 0; |
| 357 | sa1.initiator = (init[0] == 'I'); |
| 358 | if(espprint_decode_hex(ndo, sa1.spii, sizeof(sa1.spii), icookie+2)!=8) |
| 359 | return; |
| 360 | |
| 361 | if(espprint_decode_hex(ndo, sa1.spir, sizeof(sa1.spir), rcookie+2)!=8) |
| 362 | return; |
| 363 | |
| 364 | if(!espprint_decode_encalgo(ndo, enckey, &sa1)) return; |
| 365 | |
| 366 | if(!espprint_decode_authalgo(ndo, authkey, &sa1)) return; |
| 367 | |
| 368 | esp_print_addsa(ndo, &sa1, FALSE); |
| 369 | } |
| 370 | |
| 371 | /* |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 372 | * |
| 373 | * special form: file /name |
| 374 | * causes us to go read from this file instead. |
| 375 | * |
| 376 | */ |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 377 | static void esp_print_decode_onesecret(netdissect_options *ndo, char *line, |
| 378 | const char *file, int lineno) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 379 | { |
| 380 | struct sa_list sa1; |
| 381 | int sa_def; |
| 382 | |
| 383 | char *spikey; |
| 384 | char *decode; |
| 385 | |
| 386 | spikey = strsep(&line, " \t"); |
| 387 | sa_def = 0; |
| 388 | memset(&sa1, 0, sizeof(struct sa_list)); |
| 389 | |
| 390 | /* if there is only one token, then it is an algo:key token */ |
| 391 | if (line == NULL) { |
| 392 | decode = spikey; |
| 393 | spikey = NULL; |
| 394 | /* memset(&sa1.daddr, 0, sizeof(sa1.daddr)); */ |
| 395 | /* sa1.spi = 0; */ |
| 396 | sa_def = 1; |
| 397 | } else |
| 398 | decode = line; |
| 399 | |
| 400 | if (spikey && strcasecmp(spikey, "file") == 0) { |
| 401 | /* open file and read it */ |
| 402 | FILE *secretfile; |
| 403 | char fileline[1024]; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 404 | int lineno=0; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 405 | char *nl; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 406 | char *filename = line; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 407 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 408 | secretfile = fopen(filename, FOPEN_READ_TXT); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 409 | if (secretfile == NULL) { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 410 | perror(filename); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 411 | exit(3); |
| 412 | } |
| 413 | |
| 414 | while (fgets(fileline, sizeof(fileline)-1, secretfile) != NULL) { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 415 | lineno++; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 416 | /* remove newline from the line */ |
| 417 | nl = strchr(fileline, '\n'); |
| 418 | if (nl) |
| 419 | *nl = '\0'; |
| 420 | if (fileline[0] == '#') continue; |
| 421 | if (fileline[0] == '\0') continue; |
| 422 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 423 | esp_print_decode_onesecret(ndo, fileline, filename, lineno); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 424 | } |
| 425 | fclose(secretfile); |
| 426 | |
| 427 | return; |
| 428 | } |
| 429 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 430 | if (spikey && strcasecmp(spikey, "ikev2") == 0) { |
| 431 | esp_print_decode_ikeline(ndo, line, file, lineno); |
| 432 | return; |
| 433 | } |
| 434 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 435 | if (spikey) { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 436 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 437 | char *spistr, *foo; |
| 438 | u_int32_t spino; |
| 439 | struct sockaddr_in *sin; |
| 440 | #ifdef INET6 |
| 441 | struct sockaddr_in6 *sin6; |
| 442 | #endif |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 443 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 444 | spistr = strsep(&spikey, "@"); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 445 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 446 | spino = strtoul(spistr, &foo, 0); |
| 447 | if (spistr == foo || !spikey) { |
| 448 | (*ndo->ndo_warning)(ndo, "print_esp: failed to decode spi# %s\n", foo); |
| 449 | return; |
| 450 | } |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 451 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 452 | sa1.spi = spino; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 453 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 454 | sin = (struct sockaddr_in *)&sa1.daddr; |
| 455 | #ifdef INET6 |
| 456 | sin6 = (struct sockaddr_in6 *)&sa1.daddr; |
| 457 | if (inet_pton(AF_INET6, spikey, &sin6->sin6_addr) == 1) { |
| 458 | #ifdef HAVE_SOCKADDR_SA_LEN |
| 459 | sin6->sin6_len = sizeof(struct sockaddr_in6); |
| 460 | #endif |
| 461 | sin6->sin6_family = AF_INET6; |
| 462 | } else |
| 463 | #endif |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 464 | if (inet_pton(AF_INET, spikey, &sin->sin_addr) == 1) { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 465 | #ifdef HAVE_SOCKADDR_SA_LEN |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 466 | sin->sin_len = sizeof(struct sockaddr_in); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 467 | #endif |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 468 | sin->sin_family = AF_INET; |
| 469 | } else { |
| 470 | (*ndo->ndo_warning)(ndo, "print_esp: can not decode IP# %s\n", spikey); |
| 471 | return; |
| 472 | } |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | if (decode) { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 476 | /* skip any blank spaces */ |
| 477 | while (isspace((unsigned char)*decode)) |
| 478 | decode++; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 479 | |
| 480 | if(!espprint_decode_encalgo(ndo, decode, &sa1)) { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 481 | return; |
| 482 | } |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 483 | } |
| 484 | |
| 485 | esp_print_addsa(ndo, &sa1, sa_def); |
| 486 | } |
| 487 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 488 | USES_APPLE_DEPRECATED_API |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 489 | static void esp_init(netdissect_options *ndo _U_) |
| 490 | { |
| 491 | |
| 492 | OpenSSL_add_all_algorithms(); |
| 493 | EVP_add_cipher_alias(SN_des_ede3_cbc, "3des"); |
| 494 | } |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 495 | USES_APPLE_RST |
| 496 | |
| 497 | void esp_print_decodesecret(netdissect_options *ndo) |
| 498 | { |
| 499 | char *line; |
| 500 | char *p; |
| 501 | static int initialized = 0; |
| 502 | |
| 503 | if (!initialized) { |
| 504 | esp_init(ndo); |
| 505 | initialized = 1; |
| 506 | } |
| 507 | |
| 508 | p = ndo->ndo_espsecret; |
| 509 | |
| 510 | while (p && p[0] != '\0') { |
| 511 | /* pick out the first line or first thing until a comma */ |
| 512 | if ((line = strsep(&p, "\n,")) == NULL) { |
| 513 | line = p; |
| 514 | p = NULL; |
| 515 | } |
| 516 | |
| 517 | esp_print_decode_onesecret(ndo, line, "cmdline", 0); |
| 518 | } |
| 519 | |
| 520 | ndo->ndo_espsecret = NULL; |
| 521 | } |
| 522 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 523 | #endif |
| 524 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 525 | #ifdef HAVE_LIBCRYPTO |
| 526 | USES_APPLE_DEPRECATED_API |
| 527 | #endif |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 528 | int |
| 529 | esp_print(netdissect_options *ndo, |
| 530 | const u_char *bp, const int length, const u_char *bp2 |
| 531 | #ifndef HAVE_LIBCRYPTO |
| 532 | _U_ |
| 533 | #endif |
| 534 | , |
| 535 | int *nhdr |
| 536 | #ifndef HAVE_LIBCRYPTO |
| 537 | _U_ |
| 538 | #endif |
| 539 | , |
| 540 | int *padlen |
| 541 | #ifndef HAVE_LIBCRYPTO |
| 542 | _U_ |
| 543 | #endif |
| 544 | ) |
| 545 | { |
| 546 | register const struct newesp *esp; |
| 547 | register const u_char *ep; |
| 548 | #ifdef HAVE_LIBCRYPTO |
| 549 | struct ip *ip; |
| 550 | struct sa_list *sa = NULL; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 551 | #ifdef INET6 |
| 552 | struct ip6_hdr *ip6 = NULL; |
| 553 | #endif |
| 554 | int advance; |
| 555 | int len; |
| 556 | u_char *secret; |
| 557 | int ivlen = 0; |
| 558 | u_char *ivoff; |
| 559 | u_char *p; |
| 560 | EVP_CIPHER_CTX ctx; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 561 | #endif |
| 562 | |
| 563 | esp = (struct newesp *)bp; |
| 564 | |
| 565 | #ifdef HAVE_LIBCRYPTO |
| 566 | secret = NULL; |
| 567 | advance = 0; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 568 | #endif |
| 569 | |
| 570 | #if 0 |
| 571 | /* keep secret out of a register */ |
| 572 | p = (u_char *)&secret; |
| 573 | #endif |
| 574 | |
| 575 | /* 'ep' points to the end of available data. */ |
| 576 | ep = ndo->ndo_snapend; |
| 577 | |
| 578 | if ((u_char *)(esp + 1) >= ep) { |
| 579 | fputs("[|ESP]", stdout); |
| 580 | goto fail; |
| 581 | } |
| 582 | (*ndo->ndo_printf)(ndo, "ESP(spi=0x%08x", EXTRACT_32BITS(&esp->esp_spi)); |
| 583 | (*ndo->ndo_printf)(ndo, ",seq=0x%x)", EXTRACT_32BITS(&esp->esp_seq)); |
| 584 | (*ndo->ndo_printf)(ndo, ", length %u", length); |
| 585 | |
| 586 | #ifndef HAVE_LIBCRYPTO |
| 587 | goto fail; |
| 588 | #else |
| 589 | /* initiailize SAs */ |
| 590 | if (ndo->ndo_sa_list_head == NULL) { |
| 591 | if (!ndo->ndo_espsecret) |
| 592 | goto fail; |
| 593 | |
| 594 | esp_print_decodesecret(ndo); |
| 595 | } |
| 596 | |
| 597 | if (ndo->ndo_sa_list_head == NULL) |
| 598 | goto fail; |
| 599 | |
| 600 | ip = (struct ip *)bp2; |
| 601 | switch (IP_V(ip)) { |
| 602 | #ifdef INET6 |
| 603 | case 6: |
| 604 | ip6 = (struct ip6_hdr *)bp2; |
| 605 | /* we do not attempt to decrypt jumbograms */ |
| 606 | if (!EXTRACT_16BITS(&ip6->ip6_plen)) |
| 607 | goto fail; |
| 608 | /* if we can't get nexthdr, we do not need to decrypt it */ |
| 609 | len = sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen); |
| 610 | |
| 611 | /* see if we can find the SA, and if so, decode it */ |
| 612 | for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) { |
| 613 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&sa->daddr; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 614 | if (sa->spi == EXTRACT_32BITS(&esp->esp_spi) && |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 615 | sin6->sin6_family == AF_INET6 && |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 616 | UNALIGNED_MEMCMP(&sin6->sin6_addr, &ip6->ip6_dst, |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 617 | sizeof(struct in6_addr)) == 0) { |
| 618 | break; |
| 619 | } |
| 620 | } |
| 621 | break; |
| 622 | #endif /*INET6*/ |
| 623 | case 4: |
| 624 | /* nexthdr & padding are in the last fragment */ |
| 625 | if (EXTRACT_16BITS(&ip->ip_off) & IP_MF) |
| 626 | goto fail; |
| 627 | len = EXTRACT_16BITS(&ip->ip_len); |
| 628 | |
| 629 | /* see if we can find the SA, and if so, decode it */ |
| 630 | for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) { |
| 631 | struct sockaddr_in *sin = (struct sockaddr_in *)&sa->daddr; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 632 | if (sa->spi == EXTRACT_32BITS(&esp->esp_spi) && |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 633 | sin->sin_family == AF_INET && |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 634 | UNALIGNED_MEMCMP(&sin->sin_addr, &ip->ip_dst, |
| 635 | sizeof(struct in_addr)) == 0) { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 636 | break; |
| 637 | } |
| 638 | } |
| 639 | break; |
| 640 | default: |
| 641 | goto fail; |
| 642 | } |
| 643 | |
| 644 | /* if we didn't find the specific one, then look for |
| 645 | * an unspecified one. |
| 646 | */ |
| 647 | if (sa == NULL) |
| 648 | sa = ndo->ndo_sa_default; |
| 649 | |
| 650 | /* if not found fail */ |
| 651 | if (sa == NULL) |
| 652 | goto fail; |
| 653 | |
| 654 | /* if we can't get nexthdr, we do not need to decrypt it */ |
| 655 | if (ep - bp2 < len) |
| 656 | goto fail; |
| 657 | if (ep - bp2 > len) { |
| 658 | /* FCS included at end of frame (NetBSD 1.6 or later) */ |
| 659 | ep = bp2 + len; |
| 660 | } |
| 661 | |
| 662 | ivoff = (u_char *)(esp + 1) + 0; |
| 663 | ivlen = sa->ivlen; |
| 664 | secret = sa->secret; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 665 | ep = ep - sa->authlen; |
| 666 | |
| 667 | if (sa->evp) { |
| 668 | memset(&ctx, 0, sizeof(ctx)); |
| 669 | if (EVP_CipherInit(&ctx, sa->evp, secret, NULL, 0) < 0) |
| 670 | (*ndo->ndo_warning)(ndo, "espkey init failed"); |
| 671 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 672 | p = ivoff; |
| 673 | EVP_CipherInit(&ctx, NULL, NULL, p, 0); |
| 674 | EVP_Cipher(&ctx, p + ivlen, p + ivlen, ep - (p + ivlen)); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 675 | EVP_CIPHER_CTX_cleanup(&ctx); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 676 | advance = ivoff - (u_char *)esp + ivlen; |
| 677 | } else |
| 678 | advance = sizeof(struct newesp); |
| 679 | |
| 680 | /* sanity check for pad length */ |
| 681 | if (ep - bp < *(ep - 2)) |
| 682 | goto fail; |
| 683 | |
| 684 | if (padlen) |
| 685 | *padlen = *(ep - 2) + 2; |
| 686 | |
| 687 | if (nhdr) |
| 688 | *nhdr = *(ep - 1); |
| 689 | |
| 690 | (ndo->ndo_printf)(ndo, ": "); |
| 691 | return advance; |
| 692 | #endif |
| 693 | |
| 694 | fail: |
| 695 | return -1; |
| 696 | } |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 697 | #ifdef HAVE_LIBCRYPTO |
| 698 | USES_APPLE_RST |
| 699 | #endif |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 700 | |
| 701 | /* |
| 702 | * Local Variables: |
| 703 | * c-style: whitesmith |
| 704 | * c-basic-offset: 8 |
| 705 | * End: |
| 706 | */ |