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17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
18 | */ |
19 | |
19 | |
20 | #include "config.h" |
20 | #include "config.h" |
21 | |
21 | |
22 | extern "C" { |
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23 | # include "lzf/lzf.h" |
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24 | } |
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25 | |
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26 | #include <cassert> |
22 | #include <cassert> |
27 | |
23 | |
28 | #include <list> |
24 | #include <list> |
29 | |
25 | |
30 | #include <openssl/rand.h> |
26 | #include <openssl/rand.h> |
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46 | # define RAND_pseudo_bytes RAND_bytes |
42 | # define RAND_pseudo_bytes RAND_bytes |
47 | #endif |
43 | #endif |
48 | |
44 | |
49 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
45 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
50 | |
46 | |
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47 | #define ULTRA_FAST 1 |
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48 | #define HLOG 15 |
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49 | #include "lzf/lzf.h" |
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50 | #include "lzf/lzf_c.c" |
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51 | #include "lzf/lzf_d.c" |
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52 | |
51 | struct crypto_ctx |
53 | struct crypto_ctx |
52 | { |
54 | { |
53 | EVP_CIPHER_CTX cctx; |
55 | EVP_CIPHER_CTX cctx; |
54 | HMAC_CTX hctx; |
56 | HMAC_CTX hctx; |
55 | |
57 | |
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58 | }; |
60 | }; |
59 | |
61 | |
60 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
62 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
61 | { |
63 | { |
62 | EVP_CIPHER_CTX_init (&cctx); |
64 | EVP_CIPHER_CTX_init (&cctx); |
63 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
65 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
64 | HMAC_CTX_init (&hctx); |
66 | HMAC_CTX_init (&hctx); |
65 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
67 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
66 | } |
68 | } |
67 | |
69 | |
68 | crypto_ctx::~crypto_ctx () |
70 | crypto_ctx::~crypto_ctx () |
69 | { |
71 | { |
70 | EVP_CIPHER_CTX_cleanup (&cctx); |
72 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
71 | HMAC_CTX_cleanup (&hctx); |
73 | HMAC_CTX_cleanup (&hctx); |
72 | } |
74 | } |
73 | |
75 | |
74 | static void |
76 | static void |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
77 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
76 | { |
78 | { |
77 | EVP_MD_CTX ctx; |
79 | EVP_MD_CTX ctx; |
78 | |
80 | |
79 | EVP_MD_CTX_init (&ctx); |
81 | EVP_MD_CTX_init (&ctx); |
80 | EVP_DigestInit (&ctx, RSA_HASH); |
82 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
81 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
83 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
82 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
84 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
83 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
85 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
84 | EVP_MD_CTX_cleanup (&ctx); |
86 | EVP_MD_CTX_cleanup (&ctx); |
85 | } |
87 | } |
86 | |
88 | |
87 | struct rsa_entry { |
89 | struct rsa_entry { |
88 | tstamp expire; |
90 | tstamp expire; |
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310 | } |
312 | } |
311 | |
313 | |
312 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
314 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
313 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
315 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
314 | |
316 | |
315 | struct vpndata_packet:vpn_packet |
317 | struct vpndata_packet : vpn_packet |
316 | { |
318 | { |
317 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
319 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
318 | |
320 | |
319 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
321 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
320 | tap_packet *unpack (connection *conn, u32 &seqno); |
322 | tap_packet *unpack (connection *conn, u32 &seqno); |
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347 | d[0] = cl >> 8; |
349 | d[0] = cl >> 8; |
348 | d[1] = cl; |
350 | d[1] = cl; |
349 | } |
351 | } |
350 | #endif |
352 | #endif |
351 | |
353 | |
352 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
354 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
353 | |
355 | |
354 | struct { |
356 | struct { |
355 | #if RAND_SIZE |
357 | #if RAND_SIZE |
356 | u8 rnd[RAND_SIZE]; |
358 | u8 rnd[RAND_SIZE]; |
357 | #endif |
359 | #endif |
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361 | datahdr.seqno = ntohl (seqno); |
363 | datahdr.seqno = ntohl (seqno); |
362 | #if RAND_SIZE |
364 | #if RAND_SIZE |
363 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
365 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
364 | #endif |
366 | #endif |
365 | |
367 | |
366 | EVP_EncryptUpdate (cctx, |
368 | require (EVP_EncryptUpdate (cctx, |
367 | (unsigned char *) data + outl, &outl2, |
369 | (unsigned char *) data + outl, &outl2, |
368 | (unsigned char *) &datahdr, DATAHDR); |
370 | (unsigned char *) &datahdr, DATAHDR)); |
369 | outl += outl2; |
371 | outl += outl2; |
370 | |
372 | |
371 | EVP_EncryptUpdate (cctx, |
373 | require (EVP_EncryptUpdate (cctx, |
372 | (unsigned char *) data + outl, &outl2, |
374 | (unsigned char *) data + outl, &outl2, |
373 | (unsigned char *) d, l); |
375 | (unsigned char *) d, l)); |
374 | outl += outl2; |
376 | outl += outl2; |
375 | |
377 | |
376 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
378 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
377 | outl += outl2; |
379 | outl += outl2; |
378 | |
380 | |
379 | len = outl + data_hdr_size (); |
381 | len = outl + data_hdr_size (); |
380 | |
382 | |
381 | set_hdr (type, dst); |
383 | set_hdr (type, dst); |
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390 | int outl = 0, outl2; |
392 | int outl = 0, outl2; |
391 | tap_packet *p = new tap_packet; |
393 | tap_packet *p = new tap_packet; |
392 | u8 *d; |
394 | u8 *d; |
393 | u32 l = len - data_hdr_size (); |
395 | u32 l = len - data_hdr_size (); |
394 | |
396 | |
395 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
397 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
396 | |
398 | |
397 | #if ENABLE_COMPRESSION |
399 | #if ENABLE_COMPRESSION |
398 | u8 cdata[MAX_MTU]; |
400 | u8 cdata[MAX_MTU]; |
399 | |
401 | |
400 | if (type == PT_DATA_COMPRESSED) |
402 | if (type == PT_DATA_COMPRESSED) |
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402 | else |
404 | else |
403 | #endif |
405 | #endif |
404 | d = &(*p)[6 + 6 - DATAHDR]; |
406 | d = &(*p)[6 + 6 - DATAHDR]; |
405 | |
407 | |
406 | /* this overwrites part of the src mac, but we fix that later */ |
408 | /* this overwrites part of the src mac, but we fix that later */ |
407 | EVP_DecryptUpdate (cctx, |
409 | require (EVP_DecryptUpdate (cctx, |
408 | d, &outl2, |
410 | d, &outl2, |
409 | (unsigned char *)&data, len - data_hdr_size ()); |
411 | (unsigned char *)&data, len - data_hdr_size ())); |
410 | outl += outl2; |
412 | outl += outl2; |
411 | |
413 | |
412 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
414 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
413 | outl += outl2; |
415 | outl += outl2; |
414 | |
416 | |
415 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
417 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
416 | |
418 | |
417 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
419 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
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504 | |
506 | |
505 | struct auth_req_packet : config_packet |
507 | struct auth_req_packet : config_packet |
506 | { |
508 | { |
507 | char magic[8]; |
509 | char magic[8]; |
508 | u8 initiate; // false if this is just an automatic reply |
510 | u8 initiate; // false if this is just an automatic reply |
509 | u8 protocols; // supported protocols (will get patches on forward) |
511 | u8 protocols; // supported protocols (will be patched on forward) |
510 | u8 pad2, pad3; |
512 | u8 pad2, pad3; |
511 | rsaid id; |
513 | rsaid id; |
512 | rsaencrdata encr; |
514 | rsaencrdata encr; |
513 | |
515 | |
514 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
516 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
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832 | { |
834 | { |
833 | if (ictx && octx) |
835 | if (ictx && octx) |
834 | send_vpn_packet (pkt, si, tos); |
836 | send_vpn_packet (pkt, si, tos); |
835 | else |
837 | else |
836 | { |
838 | { |
837 | vpn_queue.put (new vpn_packet (*pkt)); |
839 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
838 | |
840 | |
839 | establish_connection (); |
841 | establish_connection (); |
840 | } |
842 | } |
841 | } |
843 | } |
842 | |
844 | |
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960 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
962 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
961 | |
963 | |
962 | if (!p->hmac_chk (cctx)) |
964 | if (!p->hmac_chk (cctx)) |
963 | { |
965 | { |
964 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
966 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
965 | "could be an attack, or just corruption or an synchronization error"), |
967 | "could be an attack, or just corruption or a synchronization error"), |
966 | conf->nodename, (const char *)rsi); |
968 | conf->nodename, (const char *)rsi); |
967 | break; |
969 | break; |
968 | } |
970 | } |
969 | else |
971 | else |
970 | { |
972 | { |
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1019 | { |
1021 | { |
1020 | vpndata_packet *p = (vpndata_packet *)pkt; |
1022 | vpndata_packet *p = (vpndata_packet *)pkt; |
1021 | |
1023 | |
1022 | if (!p->hmac_chk (ictx)) |
1024 | if (!p->hmac_chk (ictx)) |
1023 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1025 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1024 | "could be an attack, or just corruption or an synchronization error"), |
1026 | "could be an attack, or just corruption or a synchronization error"), |
1025 | conf->nodename, (const char *)rsi); |
1027 | conf->nodename, (const char *)rsi); |
1026 | else |
1028 | else |
1027 | { |
1029 | { |
1028 | u32 seqno; |
1030 | u32 seqno; |
1029 | tap_packet *d = p->unpack (this, seqno); |
1031 | tap_packet *d = p->unpack (this, seqno); |