#include "tls.h"
-#define TLS_DEBUG 0
-#define TLS_DEBUG_HASH 0
-#define TLS_DEBUG_DER 0
-#define TLS_DEBUG_FIXED_SECRETS 0
+//Tested against kernel.org:
+//TLS 1.2
+#define TLS_MAJ 3
+#define TLS_MIN 3
+//#define CIPHER_ID TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA // ok, recvs SERVER_KEY_EXCHANGE *** matrixssl uses this on my box
+//#define CIPHER_ID TLS_RSA_WITH_AES_256_CBC_SHA256 // ok, no SERVER_KEY_EXCHANGE
+//#define CIPHER_ID TLS_DH_anon_WITH_AES_256_CBC_SHA // SSL_ALERT_HANDSHAKE_FAILURE
+//^^^^^^^^^^^^^^^^^^^^^^^ (tested b/c this one doesn't req server certs... no luck, server refuses it)
+//#define CIPHER_ID TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 // SSL_ALERT_HANDSHAKE_FAILURE
+//#define CIPHER_ID TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 // SSL_ALERT_HANDSHAKE_FAILURE
+//#define CIPHER_ID TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 // ok, recvs SERVER_KEY_EXCHANGE
+//#define CIPHER_ID TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
+//#define CIPHER_ID TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384
+//#define CIPHER_ID TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256 // SSL_ALERT_HANDSHAKE_FAILURE
+//#define CIPHER_ID TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384
+//#define CIPHER_ID TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256 // SSL_ALERT_HANDSHAKE_FAILURE
+//#define CIPHER_ID TLS_RSA_WITH_AES_256_GCM_SHA384 // ok, no SERVER_KEY_EXCHANGE
+//#define CIPHER_ID TLS_RSA_WITH_AES_128_GCM_SHA256 // ok, no SERVER_KEY_EXCHANGE *** select this?
+
+// works against "openssl s_server -cipher NULL"
+// and against wolfssl-3.9.10-stable/examples/server/server.c:
+//#define CIPHER_ID TLS_RSA_WITH_NULL_SHA256 // for testing (does everything except encrypting)
+
+// works against wolfssl-3.9.10-stable/examples/server/server.c
+// works for kernel.org
+// does not work for cdn.kernel.org (e.g. downloading an actual tarball, not a web page)
+// getting alert 40 "handshake failure" at once
+// with GNU Wget 1.18, they agree on TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xC02F) cipher
+// fail: openssl s_client -connect cdn.kernel.org:443 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher AES256-SHA256
+// fail: openssl s_client -connect cdn.kernel.org:443 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher AES256-GCM-SHA384
+// fail: openssl s_client -connect cdn.kernel.org:443 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher AES128-SHA256
+// ok: openssl s_client -connect cdn.kernel.org:443 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher AES128-GCM-SHA256
+// ok: openssl s_client -connect cdn.kernel.org:443 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher AES128-SHA
+// (TLS_RSA_WITH_AES_128_CBC_SHA - in TLS 1.2 it's mandated to be always supported)
+#define CIPHER_ID1 TLS_RSA_WITH_AES_256_CBC_SHA256 // no SERVER_KEY_EXCHANGE from peer
+// Does not work yet:
+//#define CIPHER_ID2 TLS_RSA_WITH_AES_128_CBC_SHA
+#define CIPHER_ID2 0
+
+
+#define TLS_DEBUG 1
+#define TLS_DEBUG_HASH 1
+#define TLS_DEBUG_DER 1
+#define TLS_DEBUG_FIXED_SECRETS 1
#if 0
# define dump_raw_out(...) dump_hex(__VA_ARGS__)
#else
#define TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256 0xC031 /* 49201 */
#define TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384 0xC032 /* 49202 */
-//Tested against kernel.org:
-//TLS 1.2
-#define TLS_MAJ 3
-#define TLS_MIN 3
-//#define CIPHER_ID TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA // ok, recvs SERVER_KEY_EXCHANGE *** matrixssl uses this on my box
-//#define CIPHER_ID TLS_RSA_WITH_AES_256_CBC_SHA256 // ok, no SERVER_KEY_EXCHANGE
-//#define CIPHER_ID TLS_DH_anon_WITH_AES_256_CBC_SHA // SSL_ALERT_HANDSHAKE_FAILURE
-//^^^^^^^^^^^^^^^^^^^^^^^ (tested b/c this one doesn't req server certs... no luck, server refuses it)
-//#define CIPHER_ID TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 // SSL_ALERT_HANDSHAKE_FAILURE
-//#define CIPHER_ID TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 // SSL_ALERT_HANDSHAKE_FAILURE
-//#define CIPHER_ID TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 // ok, recvs SERVER_KEY_EXCHANGE
-//#define CIPHER_ID TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
-//#define CIPHER_ID TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384
-//#define CIPHER_ID TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256 // SSL_ALERT_HANDSHAKE_FAILURE
-//#define CIPHER_ID TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384
-//#define CIPHER_ID TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256 // SSL_ALERT_HANDSHAKE_FAILURE
-//#define CIPHER_ID TLS_RSA_WITH_AES_256_GCM_SHA384 // ok, no SERVER_KEY_EXCHANGE
-//#define CIPHER_ID TLS_RSA_WITH_AES_128_GCM_SHA256 // ok, no SERVER_KEY_EXCHANGE *** select this?
+/* Might go to libbb.h */
+#define TLS_MAX_CRYPTBLOCK_SIZE 16
+#define TLS_MAX_OUTBUF (1 << 14)
-// works against "openssl s_server -cipher NULL"
-// and against wolfssl-3.9.10-stable/examples/server/server.c:
-//#define CIPHER_ID TLS_RSA_WITH_NULL_SHA256 // for testing (does everything except encrypting)
+enum {
+ SHA_INSIZE = 64,
+ SHA1_OUTSIZE = 20,
+ SHA256_OUTSIZE = 32,
-// works against wolfssl-3.9.10-stable/examples/server/server.c
-// works for kernel.org
-// does not work for cdn.kernel.org (e.g. downloading an actual tarball, not a web page)
-// getting alert 40 "handshake failure" at once
-// with GNU Wget 1.18, they agree on TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xC02F) cipher
-// fail: openssl s_client -connect cdn.kernel.org:443 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher AES256-SHA256
-// fail: openssl s_client -connect cdn.kernel.org:443 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher AES256-GCM-SHA384
-// fail: openssl s_client -connect cdn.kernel.org:443 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher AES128-SHA256
-// ok: openssl s_client -connect cdn.kernel.org:443 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher AES128-GCM-SHA256
-// ok: openssl s_client -connect cdn.kernel.org:443 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher AES128-SHA
-// (TLS_RSA_WITH_AES_128_CBC_SHA - in TLS 1.2 it's mandated to be always supported)
-#define CIPHER_ID TLS_RSA_WITH_AES_256_CBC_SHA256 // no SERVER_KEY_EXCHANGE from peer
+ AES_BLOCKSIZE = 16,
+ AES128_KEYSIZE = 16,
+ AES256_KEYSIZE = 32,
-enum {
RSA_PREMASTER_SIZE = 48,
RECHDR_LEN = 5,
- MAX_TLS_RECORD = (1 << 14),
/* 8 = 3+5. 3 extra bytes result in record data being 32-bit aligned */
OUTBUF_PFX = 8 + AES_BLOCKSIZE, /* header + IV */
- OUTBUF_SFX = SHA256_OUTSIZE + AES_BLOCKSIZE, /* MAC + padding */
- MAX_OUTBUF = MAX_TLS_RECORD - OUTBUF_PFX - OUTBUF_SFX,
+ OUTBUF_SFX = TLS_MAX_MAC_SIZE + TLS_MAX_CRYPTBLOCK_SIZE, /* MAC + padding */
// RFC 5246
// | 6.2.1. Fragmentation
// | length
// | The length (in bytes) of the following TLSCiphertext.fragment.
// | The length MUST NOT exceed 2^14 + 2048.
- MAX_INBUF = (1 << 14) + 2048,
+ MAX_INBUF = RECHDR_LEN + (1 << 14) + 2048,
};
struct record_hdr {
};
struct tls_handshake_data {
- sha256_ctx_t handshake_sha256_ctx;
+ /* In bbox, md5/sha1/sha256 ctx's are the same structure */
+ md5sha_ctx_t handshake_hash_ctx;
+
uint8_t client_and_server_rand32[2 * 32];
uint8_t master_secret[48];
//TODO: store just the DER key here, parse/use/delete it when sending client key
//this way it will stay key type agnostic here.
psRsaKey_t server_rsa_pub_key;
+
+ unsigned saved_client_hello_size;
+ uint8_t saved_client_hello[1];
};
xfunc_die();
}
-//TODO rename this to sha256_hash, and sha256_hash -> sha256_update
-static void hash_sha256(uint8_t out[SHA256_OUTSIZE], const void *data, unsigned size)
+/* Nondestructively see the current hash value */
+static unsigned sha_peek(md5sha_ctx_t *ctx, void *buffer)
{
- sha256_ctx_t ctx;
- sha256_begin(&ctx);
- sha256_hash(&ctx, data, size);
- sha256_end(&ctx, out);
+ md5sha_ctx_t ctx_copy = *ctx; /* struct copy */
+ return sha_end(&ctx_copy, buffer);
}
-/* Nondestructively see the current hash value */
-static void sha256_peek(sha256_ctx_t *ctx, void *buffer)
+static ALWAYS_INLINE unsigned get_handshake_hash(tls_state_t *tls, void *buffer)
{
- sha256_ctx_t ctx_copy = *ctx;
- sha256_end(&ctx_copy, buffer);
+ return sha_peek(&tls->hsd->handshake_hash_ctx, buffer);
}
-#if TLS_DEBUG_HASH
-static void sha256_hash_dbg(const char *fmt, sha256_ctx_t *ctx, const void *buffer, size_t len)
+#if !TLS_DEBUG_HASH
+# define hash_handshake(tls, fmt, buffer, len) \
+ hash_handshake(tls, buffer, len)
+#endif
+static void hash_handshake(tls_state_t *tls, const char *fmt, const void *buffer, unsigned len)
{
- uint8_t h[SHA256_OUTSIZE];
-
- sha256_hash(ctx, buffer, len);
- dump_hex(fmt, buffer, len);
- dbg(" (%u) ", (int)len);
- sha256_peek(ctx, h);
- dump_hex("%s\n", h, SHA256_OUTSIZE);
-}
-#else
-# define sha256_hash_dbg(fmt, ctx, buffer, len) \
- sha256_hash(ctx, buffer, len)
+ md5sha_hash(&tls->hsd->handshake_hash_ctx, buffer, len);
+#if TLS_DEBUG_HASH
+ {
+ uint8_t h[TLS_MAX_MAC_SIZE];
+ dump_hex(fmt, buffer, len);
+ dbg(" (%u bytes) ", (int)len);
+ len = sha_peek(&tls->hsd->handshake_hash_ctx, h);
+ if (len == SHA1_OUTSIZE)
+ dump_hex("sha1:%s\n", h, len);
+ else
+ if (len == SHA256_OUTSIZE)
+ dump_hex("sha256:%s\n", h, len);
+ else
+ dump_hex("sha???:%s\n", h, len);
+ }
#endif
+}
// RFC 2104
// HMAC(key, text) based on a hash H (say, sha256) is:
// if we often need HMAC hmac with the same key.
//
// text is often given in disjoint pieces.
-static void hmac_sha256_precomputed_v(uint8_t out[SHA256_OUTSIZE],
- sha256_ctx_t *hashed_key_xor_ipad,
- sha256_ctx_t *hashed_key_xor_opad,
+static unsigned hmac_sha_precomputed_v(uint8_t *out,
+ md5sha_ctx_t *hashed_key_xor_ipad,
+ md5sha_ctx_t *hashed_key_xor_opad,
va_list va)
{
uint8_t *text;
+ unsigned len;
/* hashed_key_xor_ipad contains unclosed "H((key XOR ipad) +" state */
/* hashed_key_xor_opad contains unclosed "H((key XOR opad) +" state */
/* calculate out = H((key XOR ipad) + text) */
while ((text = va_arg(va, uint8_t*)) != NULL) {
unsigned text_size = va_arg(va, unsigned);
- sha256_hash(hashed_key_xor_ipad, text, text_size);
+ md5sha_hash(hashed_key_xor_ipad, text, text_size);
}
- sha256_end(hashed_key_xor_ipad, out);
+ len = sha_end(hashed_key_xor_ipad, out);
/* out = H((key XOR opad) + out) */
- sha256_hash(hashed_key_xor_opad, out, SHA256_OUTSIZE);
- sha256_end(hashed_key_xor_opad, out);
+ md5sha_hash(hashed_key_xor_opad, out, len);
+ return sha_end(hashed_key_xor_opad, out);
}
-static void hmac_sha256(uint8_t out[SHA256_OUTSIZE], uint8_t *key, unsigned key_size, ...)
+static unsigned hmac(tls_state_t *tls, uint8_t *out, uint8_t *key, unsigned key_size, ...)
{
- sha256_ctx_t hashed_key_xor_ipad;
- sha256_ctx_t hashed_key_xor_opad;
- uint8_t key_xor_ipad[SHA256_INSIZE];
- uint8_t key_xor_opad[SHA256_INSIZE];
+ md5sha_ctx_t hashed_key_xor_ipad;
+ md5sha_ctx_t hashed_key_xor_opad;
+ uint8_t key_xor_ipad[SHA_INSIZE];
+ uint8_t key_xor_opad[SHA_INSIZE];
uint8_t tempkey[SHA256_OUTSIZE];
va_list va;
- int i;
+ unsigned i;
va_start(va, key_size);
// block length of the hash function. Applications that use keys longer
// than INSIZE bytes will first hash the key using H and then use the
// resultant OUTSIZE byte string as the actual key to HMAC."
- if (key_size > SHA256_INSIZE) {
- hash_sha256(tempkey, key, key_size);
- key = tempkey;
- key_size = SHA256_OUTSIZE;
+ if (key_size > SHA_INSIZE) {
+ md5sha_ctx_t ctx;
+ if (tls->MAC_size == SHA256_OUTSIZE)
+ sha256_begin(&ctx);
+ else
+ sha1_begin(&ctx);
+ md5sha_hash(&ctx, key, key_size);
+ key_size = sha_end(&ctx, tempkey);
}
for (i = 0; i < key_size; i++) {
key_xor_ipad[i] = key[i] ^ 0x36;
key_xor_opad[i] = key[i] ^ 0x5c;
}
- for (; i < SHA256_INSIZE; i++) {
+ for (; i < SHA_INSIZE; i++) {
key_xor_ipad[i] = 0x36;
key_xor_opad[i] = 0x5c;
}
- sha256_begin(&hashed_key_xor_ipad);
- sha256_hash(&hashed_key_xor_ipad, key_xor_ipad, SHA256_INSIZE);
- sha256_begin(&hashed_key_xor_opad);
- sha256_hash(&hashed_key_xor_opad, key_xor_opad, SHA256_INSIZE);
- hmac_sha256_precomputed_v(out, &hashed_key_xor_ipad, &hashed_key_xor_opad, va);
+ if (tls->MAC_size == SHA256_OUTSIZE) {
+ sha256_begin(&hashed_key_xor_ipad);
+ sha256_begin(&hashed_key_xor_opad);
+ } else {
+ sha1_begin(&hashed_key_xor_ipad);
+ sha1_begin(&hashed_key_xor_opad);
+ }
+ md5sha_hash(&hashed_key_xor_ipad, key_xor_ipad, SHA_INSIZE);
+ md5sha_hash(&hashed_key_xor_opad, key_xor_opad, SHA_INSIZE);
+
+ i = hmac_sha_precomputed_v(out, &hashed_key_xor_ipad, &hashed_key_xor_opad, va);
va_end(va);
+ return i;
}
// RFC 5246:
// PRF(secret, label, seed) = P_<hash>(secret, label + seed)
//
// The label is an ASCII string.
-static void prf_hmac_sha256(
+static void prf_hmac(tls_state_t *tls,
uint8_t *outbuf, unsigned outbuf_size,
uint8_t *secret, unsigned secret_size,
const char *label,
uint8_t *seed, unsigned seed_size)
{
- uint8_t a[SHA256_OUTSIZE];
+ uint8_t a[TLS_MAX_MAC_SIZE];
uint8_t *out_p = outbuf;
unsigned label_size = strlen(label);
+ unsigned MAC_size = tls->MAC_size;
/* In P_hash() calculation, "seed" is "label + seed": */
#define SEED label, label_size, seed, seed_size
#define SECRET secret, secret_size
-#define A a, (int)(sizeof(a))
+#define A a, MAC_size
/* A(1) = HMAC_hash(secret, seed) */
- hmac_sha256(a, SECRET, SEED, NULL);
-//TODO: convert hmac_sha256 to precomputed
+ hmac(tls, a, SECRET, SEED, NULL);
+//TODO: convert hmac to precomputed
for(;;) {
/* HMAC_hash(secret, A(1) + seed) */
- if (outbuf_size <= SHA256_OUTSIZE) {
+ if (outbuf_size <= MAC_size) {
/* Last, possibly incomplete, block */
/* (use a[] as temp buffer) */
- hmac_sha256(a, SECRET, A, SEED, NULL);
+ hmac(tls, a, SECRET, A, SEED, NULL);
memcpy(out_p, a, outbuf_size);
return;
}
/* Not last block. Store directly to result buffer */
- hmac_sha256(out_p, SECRET, A, SEED, NULL);
- out_p += SHA256_OUTSIZE;
- outbuf_size -= SHA256_OUTSIZE;
+ hmac(tls, out_p, SECRET, A, SEED, NULL);
+ out_p += MAC_size;
+ outbuf_size -= MAC_size;
/* A(2) = HMAC_hash(secret, A(1)) */
- hmac_sha256(a, SECRET, A, NULL);
+ hmac(tls, a, SECRET, A, NULL);
}
#undef A
#undef SECRET
static void *tls_get_outbuf(tls_state_t *tls, int len)
{
- if (len > MAX_OUTBUF)
+ if (len > TLS_MAX_OUTBUF)
xfunc_die();
- if (tls->outbuf_size < len + OUTBUF_PFX + OUTBUF_SFX) {
- tls->outbuf_size = len + OUTBUF_PFX + OUTBUF_SFX;
- tls->outbuf = xrealloc(tls->outbuf, tls->outbuf_size);
+ len += OUTBUF_PFX + OUTBUF_SFX;
+ if (tls->outbuf_size < len) {
+ tls->outbuf_size = len;
+ tls->outbuf = xrealloc(tls->outbuf, len);
}
return tls->outbuf + OUTBUF_PFX;
}
uint8_t padding_length;
xhdr = (void*)(buf - RECHDR_LEN);
- if (CIPHER_ID != TLS_RSA_WITH_NULL_SHA256)
+ if (tls->cipher_id != TLS_RSA_WITH_NULL_SHA256)
xhdr = (void*)(buf - RECHDR_LEN - AES_BLOCKSIZE); /* place for IV */
xhdr->type = type;
xhdr->len16_lo = size & 0xff;
/* Calculate MAC signature */
-//TODO: convert hmac_sha256 to precomputed
- hmac_sha256(buf + size,
- tls->client_write_MAC_key, sizeof(tls->client_write_MAC_key),
- &tls->write_seq64_be, sizeof(tls->write_seq64_be),
- xhdr, RECHDR_LEN,
- buf, size,
- NULL);
+ hmac(tls, buf + size, /* result */
+ tls->client_write_MAC_key, tls->MAC_size,
+ &tls->write_seq64_be, sizeof(tls->write_seq64_be),
+ xhdr, RECHDR_LEN,
+ buf, size,
+ NULL
+ );
tls->write_seq64_be = SWAP_BE64(1 + SWAP_BE64(tls->write_seq64_be));
- size += SHA256_OUTSIZE;
+ size += tls->MAC_size;
// RFC 5246
// 6.2.3.1. Null or Standard Stream Cipher
// -------- ----------- ---------- --------------
// SHA HMAC-SHA1 20 20
// SHA256 HMAC-SHA256 32 32
- if (CIPHER_ID == TLS_RSA_WITH_NULL_SHA256) {
+ if (tls->cipher_id == TLS_RSA_WITH_NULL_SHA256) {
/* No encryption, only signing */
xhdr->len16_hi = size >> 8;
xhdr->len16_lo = size & 0xff;
/* Fill IV and padding in outbuf */
tls_get_random(buf - AES_BLOCKSIZE, AES_BLOCKSIZE); /* IV */
- dbg("before crypt: 5 hdr + %u data + %u hash bytes\n", size, SHA256_OUTSIZE);
+ dbg("before crypt: 5 hdr + %u data + %u hash bytes\n", size, tls->MAC_size);
// RFC is talking nonsense:
// "Padding that is added to force the length of the plaintext to be
// an integral multiple of the block cipher's block length."
{
psCipherContext_t ctx;
psAesInit(&ctx, buf - AES_BLOCKSIZE, /* IV */
- tls->client_write_key, sizeof(tls->client_write_key)
+ tls->client_write_key, tls->key_size /* selects 128/256 */
);
psAesEncrypt(&ctx,
buf, /* plaintext */
dbg("wrote %u bytes\n", (int)RECHDR_LEN + size);
}
-static void xwrite_and_update_handshake_hash(tls_state_t *tls, unsigned size)
+static void xwrite_handshake_record(tls_state_t *tls, unsigned size)
{
- if (!tls->encrypt_on_write) {
+ //if (!tls->encrypt_on_write) {
uint8_t *buf = tls->outbuf + OUTBUF_PFX;
struct record_hdr *xhdr = (void*)(buf - RECHDR_LEN);
dump_raw_out(">> %s\n", xhdr, RECHDR_LEN + size);
xwrite(tls->ofd, xhdr, RECHDR_LEN + size);
dbg("wrote %u bytes\n", (int)RECHDR_LEN + size);
+ // return;
+ //}
+ //xwrite_encrypted(tls, size, RECORD_TYPE_HANDSHAKE);
+}
+
+static void xwrite_and_update_handshake_hash(tls_state_t *tls, unsigned size)
+{
+ if (!tls->encrypt_on_write) {
+ uint8_t *buf;
+
+ xwrite_handshake_record(tls, size);
/* Handshake hash does not include record headers */
- sha256_hash_dbg(">> sha256:%s", &tls->hsd->handshake_sha256_ctx, buf, size);
+ buf = tls->outbuf + OUTBUF_PFX;
+ hash_handshake(tls, ">> hash:%s", buf, size);
return;
}
xwrite_encrypted(tls, size, RECORD_TYPE_HANDSHAKE);
sz = target - RECHDR_LEN;
/* Needs to be decrypted? */
- if (tls->min_encrypted_len_on_read > SHA256_OUTSIZE) {
+ if (tls->min_encrypted_len_on_read > tls->MAC_size) {
psCipherContext_t ctx;
uint8_t *p = tls->inbuf + RECHDR_LEN;
int padding_len;
}
/* Decrypt content+MAC+padding, moving it over IV in the process */
psAesInit(&ctx, p, /* IV */
- tls->server_write_key, sizeof(tls->server_write_key)
+ tls->server_write_key, tls->key_size /* selects 128/256 */
);
sz -= AES_BLOCKSIZE; /* we will overwrite IV now */
psAesDecrypt(&ctx,
padding_len = p[sz - 1];
dbg("encrypted size:%u type:0x%02x padding_length:0x%02x\n", sz, p[0], padding_len);
padding_len++;
- sz -= SHA256_OUTSIZE + padding_len; /* drop MAC and padding */
+ sz -= tls->MAC_size + padding_len; /* drop MAC and padding */
//if (sz < 0)
// bb_error_msg_and_die("bad padding size:%u", padding_len);
} else {
/* RFC 5246 is not saying it explicitly, but sha256 hash
* in our FINISHED record must include data of incoming packets too!
*/
- if (tls->inbuf[0] == RECORD_TYPE_HANDSHAKE) {
- sha256_hash_dbg("<< sha256:%s", &tls->hsd->handshake_sha256_ctx, tls->inbuf + RECHDR_LEN, sz);
+ if (tls->inbuf[0] == RECORD_TYPE_HANDSHAKE
+ && tls->MAC_size != 0 /* do we know which hash to use? (server_hello() does not!) */
+ ) {
+ hash_handshake(tls, "<< hash:%s", tls->inbuf + RECHDR_LEN, sz);
}
end:
dbg("got block len:%u\n", sz);
h->len24_lo = len & 0xff;
}
-static void send_client_hello(tls_state_t *tls, const char *sni)
+static void send_client_hello_and_alloc_hsd(tls_state_t *tls, const char *sni)
{
struct client_hello {
uint8_t type;
uint8_t session_id_len;
/* uint8_t session_id[]; */
uint8_t cipherid_len16_hi, cipherid_len16_lo;
- uint8_t cipherid[2 * 2]; /* actually variable */
+ uint8_t cipherid[2 * (2 + !!CIPHER_ID2)]; /* actually variable */
uint8_t comprtypes_len;
uint8_t comprtypes[1]; /* actually variable */
/* Extensions (SNI shown):
tls_get_random(record->rand32, sizeof(record->rand32));
if (TLS_DEBUG_FIXED_SECRETS)
memset(record->rand32, 0x11, sizeof(record->rand32));
- memcpy(tls->hsd->client_and_server_rand32, record->rand32, sizeof(record->rand32));
/* record->session_id_len = 0; - already is */
/* record->cipherid_len16_hi = 0; */
- record->cipherid_len16_lo = 2 * 2;
- if ((CIPHER_ID >> 8) != 0)
- record->cipherid[0] = CIPHER_ID >> 8;
- record->cipherid[1] = CIPHER_ID & 0xff;
+ record->cipherid_len16_lo = sizeof(record->cipherid);
/* RFC 5746 Renegotiation Indication Extension - some servers will refuse to work with us otherwise */
- /*record->cipherid[2] = TLS_EMPTY_RENEGOTIATION_INFO_SCSV >> 8; - zero */
- record->cipherid[3] = TLS_EMPTY_RENEGOTIATION_INFO_SCSV & 0xff;
+ /*record->cipherid[0] = TLS_EMPTY_RENEGOTIATION_INFO_SCSV >> 8; - zero */
+ record->cipherid[1] = TLS_EMPTY_RENEGOTIATION_INFO_SCSV & 0xff;
+ if ((CIPHER_ID1 >> 8) != 0) record->cipherid[2] = CIPHER_ID1 >> 8;
+ /*************************/ record->cipherid[3] = CIPHER_ID1 & 0xff;
+#if CIPHER_ID2
+ if ((CIPHER_ID2 >> 8) != 0) record->cipherid[4] = CIPHER_ID2 >> 8;
+ /*************************/ record->cipherid[5] = CIPHER_ID2 & 0xff;
+#endif
record->comprtypes_len = 1;
/* record->comprtypes[0] = 0; */
}
dbg(">> CLIENT_HELLO\n");
- xwrite_and_update_handshake_hash(tls, len);
+ /* Can hash it only when we know which MAC hash to use */
+ /*xwrite_and_update_handshake_hash(tls, len); - WRONG! */
+ xwrite_handshake_record(tls, len);
+
+ tls->hsd = xzalloc(sizeof(*tls->hsd) + len);
+ tls->hsd->saved_client_hello_size = len;
+ memcpy(tls->hsd->saved_client_hello, record, len);
+ memcpy(tls->hsd->client_and_server_rand32, record->rand32, sizeof(record->rand32));
}
static void get_server_hello(tls_state_t *tls)
struct server_hello *hp;
uint8_t *cipherid;
- int len;
+ unsigned cipher;
+ int len, len24;
len = tls_xread_handshake_block(tls, 74);
}
cipherid = &hp->cipherid_hi;
+ len24 = hp->len24_lo;
if (hp->session_id_len != 32) {
if (hp->session_id_len != 0)
tls_error_die(tls);
// may return an empty session_id to indicate that the session will
// not be cached and therefore cannot be resumed."
cipherid -= 32;
- hp->len24_lo += 32; /* what len would be if session id would be present */
+ len24 += 32; /* what len would be if session id would be present */
}
- if (hp->len24_lo < 70
- || cipherid[0] != (CIPHER_ID >> 8)
- || cipherid[1] != (CIPHER_ID & 0xff)
- || cipherid[2] != 0 /* comprtype */
+ if (len24 < 70
+// || cipherid[0] != (CIPHER_ID >> 8)
+// || cipherid[1] != (CIPHER_ID & 0xff)
+// || cipherid[2] != 0 /* comprtype */
) {
tls_error_die(tls);
}
-
dbg("<< SERVER_HELLO\n");
+
memcpy(tls->hsd->client_and_server_rand32 + 32, hp->rand32, sizeof(hp->rand32));
+
+ tls->cipher_id = cipher = 0x100 * cipherid[0] + cipherid[1];
+ dbg("server chose cipher %04x\n", cipher);
+
+ if (cipher == TLS_RSA_WITH_AES_128_CBC_SHA) {
+ tls->key_size = AES128_KEYSIZE;
+ tls->MAC_size = SHA1_OUTSIZE;
+ sha1_begin(&tls->hsd->handshake_hash_ctx);
+ }
+ else { /* TLS_RSA_WITH_AES_256_CBC_SHA256 */
+ tls->key_size = AES256_KEYSIZE;
+ tls->MAC_size = SHA256_OUTSIZE;
+ sha256_begin(&tls->hsd->handshake_hash_ctx);
+ }
+ hash_handshake(tls, ">> client hello hash:%s",
+ tls->hsd->saved_client_hello, tls->hsd->saved_client_hello_size
+ );
+ hash_handshake(tls, "<< server hello hash:%s",
+ tls->inbuf + RECHDR_LEN, len
+ );
}
static void get_server_cert(tls_state_t *tls)
// [0..47];
// The master secret is always exactly 48 bytes in length. The length
// of the premaster secret will vary depending on key exchange method.
- prf_hmac_sha256(
+ prf_hmac(tls,
tls->hsd->master_secret, sizeof(tls->hsd->master_secret),
rsa_premaster, sizeof(rsa_premaster),
"master secret",
memcpy(&tmp64[0] , &tls->hsd->client_and_server_rand32[32], 32);
memcpy(&tmp64[32], &tls->hsd->client_and_server_rand32[0] , 32);
- prf_hmac_sha256(
- tls->client_write_MAC_key, 2 * (SHA256_OUTSIZE + AES256_KEYSIZE),
+ prf_hmac(tls,
+ tls->client_write_MAC_key, 2 * (tls->MAC_size + tls->key_size),
// also fills:
- // server_write_MAC_key[SHA256_OUTSIZE]
- // client_write_key[AES256_KEYSIZE]
- // server_write_key[AES256_KEYSIZE]
+ // server_write_MAC_key[]
+ // client_write_key[]
+ // server_write_key[]
tls->hsd->master_secret, sizeof(tls->hsd->master_secret),
"key expansion",
tmp64, 64
);
+ tls->client_write_key = tls->client_write_MAC_key + (2 * tls->MAC_size);
+ tls->server_write_key = tls->client_write_key + tls->key_size;
dump_hex("client_write_MAC_key:%s\n",
- tls->client_write_MAC_key, sizeof(tls->client_write_MAC_key)
+ tls->client_write_MAC_key, tls->MAC_size
);
dump_hex("client_write_key:%s\n",
- tls->client_write_key, sizeof(tls->client_write_key)
+ tls->client_write_key, tls->key_size
);
}
}
uint8_t prf_result[12];
};
struct finished *record = tls_get_outbuf(tls, sizeof(*record));
- uint8_t handshake_hash[SHA256_OUTSIZE];
+ uint8_t handshake_hash[TLS_MAX_MAC_SIZE];
+ unsigned len;
fill_handshake_record_hdr(record, HANDSHAKE_FINISHED, sizeof(*record));
- sha256_peek(&tls->hsd->handshake_sha256_ctx, handshake_hash);
- prf_hmac_sha256(record->prf_result, sizeof(record->prf_result),
- tls->hsd->master_secret, sizeof(tls->hsd->master_secret),
- "client finished",
- handshake_hash, sizeof(handshake_hash)
+ len = get_handshake_hash(tls, handshake_hash);
+ prf_hmac(tls,
+ record->prf_result, sizeof(record->prf_result),
+ tls->hsd->master_secret, sizeof(tls->hsd->master_secret),
+ "client finished",
+ handshake_hash, len
);
dump_hex("from secret: %s\n", tls->hsd->master_secret, sizeof(tls->hsd->master_secret));
dump_hex("from labelSeed: %s", "client finished", sizeof("client finished")-1);
// Application Data <------> Application Data
int len;
- tls->hsd = xzalloc(sizeof(*tls->hsd));
- sha256_begin(&tls->hsd->handshake_sha256_ctx);
-
- send_client_hello(tls, sni);
+ send_client_hello_and_alloc_hsd(tls, sni);
get_server_hello(tls);
// RFC 5246
if (len != 1 || memcmp(tls->inbuf, rec_CHANGE_CIPHER_SPEC, 6) != 0)
tls_error_die(tls);
dbg("<< CHANGE_CIPHER_SPEC\n");
- if (CIPHER_ID == TLS_RSA_WITH_NULL_SHA256)
- tls->min_encrypted_len_on_read = SHA256_OUTSIZE;
+ if (tls->cipher_id == TLS_RSA_WITH_NULL_SHA256)
+ tls->min_encrypted_len_on_read = tls->MAC_size;
else
/* all incoming packets now should be encrypted and have IV + MAC + padding */
- tls->min_encrypted_len_on_read = AES_BLOCKSIZE + SHA256_OUTSIZE + AES_BLOCKSIZE;
+ tls->min_encrypted_len_on_read = AES_BLOCKSIZE + tls->MAC_size + AES_BLOCKSIZE;
/* Get (encrypted) FINISHED from the server */
len = tls_xread_record(tls);
/* free handshake data */
// if (PARANOIA)
-// memset(tls->hsd, 0, sizeof(*tls->hsd));
+// memset(tls->hsd, 0, tls->hsd->hsd_size);
free(tls->hsd);
tls->hsd = NULL;
}
* read, encrypt and send bigger chunks
*/
inbuf_size += INBUF_STEP;
- if (inbuf_size > MAX_OUTBUF)
- inbuf_size = MAX_OUTBUF;
+ if (inbuf_size > TLS_MAX_OUTBUF)
+ inbuf_size = TLS_MAX_OUTBUF;
}
tls_xwrite(tls, nread);
}
projects / oweals / busybox.git / commitdiff