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-rw-r--r--include/libbb.h17
-rw-r--r--networking/tls.c360
-rw-r--r--networking/tls.h3
-rw-r--r--networking/tls_aes.c15
-rw-r--r--networking/tls_aes.h8
-rw-r--r--networking/tls_aesgcm.c148
-rw-r--r--networking/tls_aesgcm.h15
-rw-r--r--networking/tls_fe.c2
-rw-r--r--networking/tls_fe.h2
-rw-r--r--networking/tls_rsa.c2
-rw-r--r--networking/tls_rsa.h2
11 files changed, 480 insertions, 94 deletions
diff --git a/include/libbb.h b/include/libbb.h
index aa9e9d0..b041ce0 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -736,10 +736,17 @@ struct hostent *xgethostbyname(const char *name) FAST_FUNC;
// + inet_common.c has additional IPv4-only stuff
+struct tls_aes {
+ uint32_t key[60];
+ unsigned rounds;
+};
#define TLS_MAX_MAC_SIZE 32
#define TLS_MAX_KEY_SIZE 32
+#define TLS_MAX_IV_SIZE 4
struct tls_handshake_data; /* opaque */
typedef struct tls_state {
+ unsigned flags;
+
int ofd;
int ifd;
@@ -748,6 +755,7 @@ typedef struct tls_state {
uint8_t encrypt_on_write;
unsigned MAC_size;
unsigned key_size;
+ unsigned IV_size;
uint8_t *outbuf;
int outbuf_size;
@@ -769,12 +777,21 @@ typedef struct tls_state {
/*uint64_t read_seq64_be;*/
uint64_t write_seq64_be;
+ /*uint8_t *server_write_MAC_key;*/
uint8_t *client_write_key;
uint8_t *server_write_key;
+ uint8_t *client_write_IV;
+ uint8_t *server_write_IV;
uint8_t client_write_MAC_key[TLS_MAX_MAC_SIZE];
uint8_t server_write_MAC_k__[TLS_MAX_MAC_SIZE];
uint8_t client_write_k__[TLS_MAX_KEY_SIZE];
uint8_t server_write_k__[TLS_MAX_KEY_SIZE];
+ uint8_t client_write_I_[TLS_MAX_IV_SIZE];
+ uint8_t server_write_I_[TLS_MAX_IV_SIZE];
+
+ struct tls_aes aes_encrypt;
+ struct tls_aes aes_decrypt;
+ uint8_t H[16]; //used by AES_GCM
} tls_state_t;
static inline tls_state_t *new_tls_state(void)
diff --git a/networking/tls.c b/networking/tls.c
index fba66f6..38a965a 100644
--- a/networking/tls.c
+++ b/networking/tls.c
@@ -13,16 +13,17 @@
//kbuild:lib-$(CONFIG_TLS) += tls_pstm_mul_comba.o
//kbuild:lib-$(CONFIG_TLS) += tls_pstm_sqr_comba.o
//kbuild:lib-$(CONFIG_TLS) += tls_aes.o
+//kbuild:lib-$(CONFIG_TLS) += tls_aesgcm.o
//kbuild:lib-$(CONFIG_TLS) += tls_rsa.o
//kbuild:lib-$(CONFIG_TLS) += tls_fe.o
-////kbuild:lib-$(CONFIG_TLS) += tls_aes_gcm.o
#include "tls.h"
-//Tested against kernel.org:
//TLS 1.2
#define TLS_MAJ 3
#define TLS_MIN 3
+
+//Tested against kernel.org:
//#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
@@ -36,7 +37,7 @@
//#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?
+//#define CIPHER_ID TLS_RSA_WITH_AES_128_GCM_SHA256 // ok, no SERVER_KEY_EXCHANGE
// works against "openssl s_server -cipher NULL"
// and against wolfssl-3.9.10-stable/examples/server/server.c:
@@ -60,6 +61,11 @@
// bug #11456: host is.gd accepts only ECDHE-ECDSA-foo (the simplest which works: ECDHE-ECDSA-AES128-SHA 0xC009)
#define CIPHER_ID3 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
+// ftp.openbsd.org only supports ECDHE-RSA-AESnnn-GCM-SHAnnn or ECDHE-RSA-CHACHA20-POLY1305
+#define CIPHER_ID4 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
+
+#define NUM_CIPHERS 4
+
#define TLS_DEBUG 0
#define TLS_DEBUG_HASH 0
@@ -207,7 +213,6 @@ enum {
SHA1_OUTSIZE = 20,
SHA256_OUTSIZE = 32,
- AES_BLOCKSIZE = 16,
AES128_KEYSIZE = 16,
AES256_KEYSIZE = 32,
@@ -216,7 +221,7 @@ enum {
RECHDR_LEN = 5,
/* 8 = 3+5. 3 extra bytes result in record data being 32-bit aligned */
- OUTBUF_PFX = 8 + AES_BLOCKSIZE, /* header + IV */
+ OUTBUF_PFX = 8 + AES_BLOCK_SIZE, /* header + IV */
OUTBUF_SFX = TLS_MAX_MAC_SIZE + TLS_MAX_CRYPTBLOCK_SIZE, /* MAC + padding */
// RFC 5246
@@ -263,8 +268,11 @@ struct record_hdr {
};
enum {
- KEY_ALG_RSA,
- KEY_ALG_ECDSA,
+ NEED_EC_KEY = 1 << 0,
+ GOT_CERT_RSA_KEY_ALG = 1 << 1,
+ GOT_CERT_ECDSA_KEY_ALG = 1 << 2,
+ GOT_EC_KEY = 1 << 3,
+ ENCRYPTION_AESGCM = 1 << 4,
};
struct tls_handshake_data {
/* In bbox, md5/sha1/sha256 ctx's are the same structure */
@@ -273,14 +281,14 @@ struct tls_handshake_data {
uint8_t client_and_server_rand32[2 * 32];
uint8_t master_secret[48];
- smallint key_alg;
//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;
uint8_t ecc_pub_key32[32];
- unsigned saved_client_hello_size;
- uint8_t saved_client_hello[1];
+/* HANDSHAKE HASH: */
+ //unsigned saved_client_hello_size;
+ //uint8_t saved_client_hello[1];
};
@@ -609,7 +617,7 @@ static void *tls_get_zeroed_outbuf(tls_state_t *tls, int len)
return record;
}
-static void xwrite_encrypted(tls_state_t *tls, unsigned size, unsigned type)
+static void xwrite_encrypted_and_hmac_signed(tls_state_t *tls, unsigned size, unsigned type)
{
uint8_t *buf = tls->outbuf + OUTBUF_PFX;
struct record_hdr *xhdr;
@@ -619,7 +627,7 @@ static void xwrite_encrypted(tls_state_t *tls, unsigned size, unsigned type)
if (CIPHER_ID1 != TLS_RSA_WITH_NULL_SHA256 /* if "no encryption" can't be selected */
|| tls->cipher_id != TLS_RSA_WITH_NULL_SHA256 /* or if it wasn't selected */
) {
- xhdr = (void*)(buf - RECHDR_LEN - AES_BLOCKSIZE); /* place for IV */
+ xhdr = (void*)(buf - RECHDR_LEN - AES_BLOCK_SIZE); /* place for IV */
}
xhdr->type = type;
@@ -722,7 +730,7 @@ static void xwrite_encrypted(tls_state_t *tls, unsigned size, unsigned type)
// AES_128_CBC Block 16 16 16
// AES_256_CBC Block 32 16 16
- tls_get_random(buf - AES_BLOCKSIZE, AES_BLOCKSIZE); /* IV */
+ tls_get_random(buf - AES_BLOCK_SIZE, AES_BLOCK_SIZE); /* IV */
dbg("before crypt: 5 hdr + %u data + %u hash bytes\n",
size - tls->MAC_size, tls->MAC_size);
@@ -742,23 +750,24 @@ static void xwrite_encrypted(tls_state_t *tls, unsigned size, unsigned type)
// If you need no bytes to reach BLOCKSIZE, you have to pad a full
// BLOCKSIZE with bytes of value (BLOCKSIZE-1).
// It's ok to have more than minimum padding, but we do minimum.
- padding_length = (~size) & (AES_BLOCKSIZE - 1);
+ padding_length = (~size) & (AES_BLOCK_SIZE - 1);
do {
buf[size++] = padding_length; /* padding */
- } while ((size & (AES_BLOCKSIZE - 1)) != 0);
+ } while ((size & (AES_BLOCK_SIZE - 1)) != 0);
/* Encrypt content+MAC+padding in place */
+//optimize key setup
aes_cbc_encrypt(
tls->client_write_key, tls->key_size, /* selects 128/256 */
- buf - AES_BLOCKSIZE, /* IV */
+ buf - AES_BLOCK_SIZE, /* IV */
buf, size, /* plaintext */
buf /* ciphertext */
);
/* Write out */
dbg("writing 5 + %u IV + %u encrypted bytes, padding_length:0x%02x\n",
- AES_BLOCKSIZE, size, padding_length);
- size += AES_BLOCKSIZE; /* + IV */
+ AES_BLOCK_SIZE, size, padding_length);
+ size += AES_BLOCK_SIZE; /* + IV */
xhdr->len16_hi = size >> 8;
xhdr->len16_lo = size & 0xff;
dump_raw_out(">> %s\n", xhdr, RECHDR_LEN + size);
@@ -766,23 +775,109 @@ static void xwrite_encrypted(tls_state_t *tls, unsigned size, unsigned type)
dbg("wrote %u bytes\n", (int)RECHDR_LEN + size);
}
+/* Example how GCM encryption combines nonce, aad, input and generates
+ * "header | exp_nonce | encrypted output | tag":
+ * nonce:0d 6a 26 31 00 00 00 00 00 00 00 01 (implicit 4 bytes (derived from master secret), then explicit 8 bytes)
+ * aad: 00 00 00 00 00 00 00 01 17 03 03 00 1c
+ * in: 47 45 54 20 2f 69 6e 64 65 78 2e 68 74 6d 6c 20 48 54 54 50 2f 31 2e 30 0d 0a 0d 0a "GET /index.html HTTP/1.0\r\n\r\n" (0x1c bytes)
+ * out: f7 8a b2 8f 78 0e f6 d5 76 17 2e b5 6d 46 59 56 8b 46 9f 0b d9 2c 35 28 13 66 19 be
+ * tag: c2 86 ce 4a 50 4a d0 aa 50 b3 76 5c 49 2a 3f 33
+ * sent: 17 03 03 00 34|00 00 00 00 00 00 00 01|f7 8a b2 8f 78 0e f6 d5 76 17 2e b5 6d 46 59 56 8b 46 9f 0b d9 2c 35 28 13 66 19 be|c2 86 ce 4a 50 4a d0 aa 50 b3 76 5c 49 2a 3f 33
+ * .............................................^^ buf points here
+ */
+static void xwrite_encrypted_aesgcm(tls_state_t *tls, unsigned size, unsigned type)
+{
+//go for [16]
+ uint8_t aad[13];
+ uint8_t nonce[12 + 4]; /* +4 creates space for AES block counter */
+ uint8_t scratch[AES_BLOCK_SIZE]; //[16]
+ uint8_t authtag[AES_BLOCK_SIZE]; //[16]
+ uint8_t *buf;
+ struct record_hdr *xhdr;
+ unsigned remaining;
+ unsigned cnt;
+
+ buf = tls->outbuf + OUTBUF_PFX; /* see above for the byte it points to */
+ dump_hex("xwrite_encrypted_aesgcm plaintext:%s\n", buf, size);
+
+ xhdr = (void*)(buf - 8 - RECHDR_LEN);
+ xhdr->type = type; /* do it here so that "type" param no longer used */
+
+ aad[8] = type;
+ aad[9] = TLS_MAJ;
+ aad[10] = TLS_MIN;
+ aad[11] = size >> 8;
+ aad[12] = size & 0xff;
+
+ memcpy(nonce, tls->client_write_IV, 4);
+ memcpy(nonce + 4, &tls->write_seq64_be, 8);
+ memcpy(aad, &tls->write_seq64_be, 8);
+ memcpy(buf - 8, &tls->write_seq64_be, 8);
+//optimize
+ /* seq64 is not used later in this func, can increment here */
+ tls->write_seq64_be = SWAP_BE64(1 + SWAP_BE64(tls->write_seq64_be));
+
+#define COUNTER(v) (*(uint32_t*)(v + 12))
+
+ cnt = 1;
+ remaining = size;
+ while (remaining != 0) {
+ unsigned n;
+
+ cnt++;
+ COUNTER(nonce) = htonl(cnt); /* yes, first cnt here is 2 (!) */
+ aes_encrypt_one_block(&tls->aes_encrypt, nonce, scratch);
+ n = remaining > AES_BLOCK_SIZE ? AES_BLOCK_SIZE : remaining;
+ xorbuf(buf, scratch, n);
+ buf += n;
+ remaining -= n;
+ }
+
+//optimize fixed sizes
+ aesgcm_GHASH(tls->H, aad, sizeof(aad), tls->outbuf + OUTBUF_PFX, size, authtag, sizeof(authtag));
+ COUNTER(nonce) = htonl(1);
+ aes_encrypt_one_block(&tls->aes_encrypt, nonce, scratch);
+ xorbuf(authtag, scratch, sizeof(authtag));
+
+ memcpy(buf, authtag, sizeof(authtag));
+#undef COUNTER
+
+ /* Write out */
+ xhdr = (void*)(tls->outbuf + OUTBUF_PFX - 8 - RECHDR_LEN);
+ size += 8 + sizeof(authtag);
+ /*xhdr->type = type; - already is */
+ xhdr->proto_maj = TLS_MAJ;
+ xhdr->proto_min = TLS_MIN;
+ xhdr->len16_hi = size >> 8;
+ xhdr->len16_lo = size & 0xff;
+ size += RECHDR_LEN;
+ dump_raw_out(">> %s\n", xhdr, size);
+ xwrite(tls->ofd, xhdr, size);
+ dbg("wrote %u bytes\n", size);
+}
+
+static void xwrite_encrypted(tls_state_t *tls, unsigned size, unsigned type)
+{
+ if (!(tls->flags & ENCRYPTION_AESGCM)) {
+ xwrite_encrypted_and_hmac_signed(tls, size, type);
+ return;
+ }
+ xwrite_encrypted_aesgcm(tls, size, type);
+}
+
static void xwrite_handshake_record(tls_state_t *tls, unsigned size)
{
- //if (!tls->encrypt_on_write) {
- uint8_t *buf = tls->outbuf + OUTBUF_PFX;
- struct record_hdr *xhdr = (void*)(buf - RECHDR_LEN);
+ uint8_t *buf = tls->outbuf + OUTBUF_PFX;
+ struct record_hdr *xhdr = (void*)(buf - RECHDR_LEN);
- xhdr->type = RECORD_TYPE_HANDSHAKE;
- xhdr->proto_maj = TLS_MAJ;
- xhdr->proto_min = TLS_MIN;
- xhdr->len16_hi = size >> 8;
- xhdr->len16_lo = size & 0xff;
- 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);
+ xhdr->type = RECORD_TYPE_HANDSHAKE;
+ xhdr->proto_maj = TLS_MAJ;
+ xhdr->proto_min = TLS_MIN;
+ xhdr->len16_hi = size >> 8;
+ xhdr->len16_lo = size & 0xff;
+ 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);
}
static void xwrite_and_update_handshake_hash(tls_state_t *tls, unsigned size)
@@ -826,6 +921,52 @@ static const char *alert_text(int code)
return itoa(code);
}
+static void tls_aesgcm_decrypt(tls_state_t *tls, uint8_t *buf, int size)
+{
+//go for [16]
+ //uint8_t aad[13];
+ uint8_t nonce[12 + 4]; /* +4 creates space for AES block counter */
+ uint8_t scratch[AES_BLOCK_SIZE]; //[16]
+ //uint8_t authtag[AES_BLOCK_SIZE]; //[16]
+ unsigned remaining;
+ unsigned cnt;
+
+ //aad[8] = type;
+ //aad[9] = TLS_MAJ;
+ //aad[10] = TLS_MIN;
+ //aad[11] = size >> 8;
+ //aad[12] = size & 0xff;
+
+ memcpy(nonce, tls->server_write_IV, 4);
+ memcpy(nonce + 4, buf, 8);
+ buf += 8;
+
+#define COUNTER(v) (*(uint32_t*)(v + 12))
+
+ cnt = 1;
+ remaining = size;
+ while (remaining != 0) {
+ unsigned n;
+
+ cnt++;
+ COUNTER(nonce) = htonl(cnt); /* yes, first cnt here is 2 (!) */
+ aes_encrypt_one_block(&tls->aes_decrypt, nonce, scratch);
+ n = remaining > AES_BLOCK_SIZE ? AES_BLOCK_SIZE : remaining;
+ xorbuf(buf, scratch, n);
+ buf += n;
+ remaining -= n;
+ }
+
+////optimize fixed sizes
+ //aesgcm_GHASH(tls->H, aad, sizeof(aad), tls->outbuf + OUTBUF_PFX, size, authtag, sizeof(authtag));
+ //COUNTER(nonce) = htonl(1);
+ //aes_encrypt_one_block(&tls->aes_encrypt, nonce, scratch);
+ //xorbuf(authtag, scratch, sizeof(authtag));
+
+ //memcmp(buf, authtag, sizeof(authtag)) || DIE("HASH DOES NOT MATCH!");
+#undef COUNTER
+}
+
static int tls_xread_record(tls_state_t *tls, const char *expected)
{
struct record_hdr *xhdr;
@@ -896,34 +1037,44 @@ static int tls_xread_record(tls_state_t *tls, const char *expected)
sz = target - RECHDR_LEN;
/* Needs to be decrypted? */
- if (tls->min_encrypted_len_on_read > tls->MAC_size) {
- uint8_t *p = tls->inbuf + RECHDR_LEN;
- int padding_len;
-
- if (sz & (AES_BLOCKSIZE-1)
- || sz < (int)tls->min_encrypted_len_on_read
- ) {
- bb_error_msg_and_die("bad encrypted len:%u < %u",
- sz, tls->min_encrypted_len_on_read);
+ if (tls->min_encrypted_len_on_read != 0) {
+ if (sz < (int)tls->min_encrypted_len_on_read)
+ bb_error_msg_and_die("bad encrypted len:%u", sz);
+
+ if (tls->flags & ENCRYPTION_AESGCM) {
+ /* AESGCM */
+ uint8_t *p = tls->inbuf + RECHDR_LEN;
+
+ sz -= 8 + AES_BLOCK_SIZE; /* we will overwrite nonce, drop hash */
+ tls_aesgcm_decrypt(tls, p, sz);
+ memmove(p, p + 8, sz);
+ dbg("encrypted size:%u\n", sz);
+ } else
+ if (tls->min_encrypted_len_on_read > tls->MAC_size) {
+ /* AES+SHA */
+ uint8_t *p = tls->inbuf + RECHDR_LEN;
+ int padding_len;
+
+ if (sz & (AES_BLOCK_SIZE-1))
+ bb_error_msg_and_die("bad encrypted len:%u", sz);
+
+ /* Decrypt content+MAC+padding, moving it over IV in the process */
+ sz -= AES_BLOCK_SIZE; /* we will overwrite IV now */
+ aes_cbc_decrypt(
+ tls->server_write_key, tls->key_size, /* selects 128/256 */
+ p, /* IV */
+ p + AES_BLOCK_SIZE, sz, /* ciphertext */
+ p /* plaintext */
+ );
+ 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 -= tls->MAC_size + padding_len; /* drop MAC and padding */
+ } else {
+ /* if nonzero, then it's TLS_RSA_WITH_NULL_SHA256: drop MAC */
+ /* else: no encryption yet on input, subtract zero = NOP */
+ sz -= tls->min_encrypted_len_on_read;
}
- /* Decrypt content+MAC+padding, moving it over IV in the process */
- sz -= AES_BLOCKSIZE; /* we will overwrite IV now */
- aes_cbc_decrypt(
- tls->server_write_key, tls->key_size, /* selects 128/256 */
- p, /* IV */
- p + AES_BLOCKSIZE, sz, /* ciphertext */
- p /* plaintext */
- );
- 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 -= tls->MAC_size + padding_len; /* drop MAC and padding */
- //if (sz < 0)
- // bb_error_msg_and_die("bad padding size:%u", padding_len);
- } else {
- /* if nonzero, then it's TLS_RSA_WITH_NULL_SHA256: drop MAC */
- /* else: no encryption yet on input, subtract zero = NOP */
- sz -= tls->min_encrypted_len_on_read;
}
if (sz < 0)
bb_error_msg_and_die("encrypted data too short");
@@ -964,7 +1115,8 @@ static int tls_xread_record(tls_state_t *tls, const char *expected)
* in our FINISHED record must include data of incoming packets too!
*/
if (tls->inbuf[0] == RECORD_TYPE_HANDSHAKE
- && tls->MAC_size != 0 /* do we know which hash to use? (server_hello() does not!) */
+/* HANDSHAKE HASH: */
+ // && do_we_know_which_hash_to_use /* server_hello() might not know it in the future! */
) {
hash_handshake(tls, "<< hash:%s", tls->inbuf + RECHDR_LEN, sz);
}
@@ -1198,16 +1350,16 @@ static void find_key_in_der_cert(tls_state_t *tls, uint8_t *der, int len)
};
if (memcmp(der, OID_RSA_KEY_ALG, sizeof(OID_RSA_KEY_ALG)) == 0) {
dbg("RSA key\n");
- tls->hsd->key_alg = KEY_ALG_RSA;
+ tls->flags |= GOT_CERT_RSA_KEY_ALG;
} else
if (memcmp(der, OID_ECDSA_KEY_ALG, sizeof(OID_ECDSA_KEY_ALG)) == 0) {
dbg("ECDSA key\n");
- tls->hsd->key_alg = KEY_ALG_ECDSA;
+ tls->flags |= GOT_CERT_ECDSA_KEY_ALG;
} else
- bb_error_msg_and_die("not RSA or ECDSA key");
+ bb_error_msg_and_die("not RSA or ECDSA cert");
}
- if (tls->hsd->key_alg == KEY_ALG_RSA) {
+ if (tls->flags & GOT_CERT_RSA_KEY_ALG) {
/* parse RSA key: */
//based on getAsnRsaPubKey(), pkcs1ParsePrivBin() is also of note
/* skip subjectPublicKeyInfo.algorithm */
@@ -1301,7 +1453,7 @@ static void send_client_hello_and_alloc_hsd(tls_state_t *tls, const char *sni)
uint8_t session_id_len;
/* uint8_t session_id[]; */
uint8_t cipherid_len16_hi, cipherid_len16_lo;
- uint8_t cipherid[2 * (2 + !!CIPHER_ID2 + !!CIPHER_ID3)]; /* actually variable */
+ uint8_t cipherid[2 * (1 + NUM_CIPHERS)]; /* actually variable */
uint8_t comprtypes_len;
uint8_t comprtypes[1]; /* actually variable */
/* Extensions (SNI shown):
@@ -1364,6 +1516,10 @@ static void send_client_hello_and_alloc_hsd(tls_state_t *tls, const char *sni)
if ((CIPHER_ID3 >> 8) != 0) record->cipherid[6] = CIPHER_ID3 >> 8;
/*************************/ record->cipherid[7] = CIPHER_ID3 & 0xff;
#endif
+#if CIPHER_ID4
+ if ((CIPHER_ID4 >> 8) != 0) record->cipherid[6] = CIPHER_ID4 >> 8;
+ /*************************/ record->cipherid[7] = CIPHER_ID4 & 0xff;
+#endif
record->comprtypes_len = 1;
/* record->comprtypes[0] = 0; */
@@ -1385,15 +1541,23 @@ static void send_client_hello_and_alloc_hsd(tls_state_t *tls, const char *sni)
}
memcpy(ptr, supported_groups, sizeof(supported_groups));
- dbg(">> CLIENT_HELLO\n");
- /* 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 = xzalloc(sizeof(*tls->hsd));
+ /* HANDSHAKE HASH: ^^^ + len if need to save saved_client_hello */
+ memcpy(tls->hsd->client_and_server_rand32, record->rand32, sizeof(record->rand32));
+/* HANDSHAKE HASH:
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));
+ */
+ dbg(">> CLIENT_HELLO\n");
+ /* Can hash immediately only if we know which MAC hash to use.
+ * So far we do know: it's sha256:
+ */
+ sha256_begin(&tls->hsd->handshake_hash_ctx);
+ xwrite_and_update_handshake_hash(tls, len);
+ /* if this would become infeasible: save tls->hsd->saved_client_hello,
+ * use "xwrite_handshake_record(tls, len)" here,
+ * and hash saved_client_hello later.
+ */
}
static void get_server_hello(tls_state_t *tls)
@@ -1463,18 +1627,28 @@ static void get_server_hello(tls_state_t *tls)
if (cipher == TLS_RSA_WITH_AES_128_CBC_SHA
|| cipher == TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
) {
+ if (cipher == TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA)
+ tls->flags |= NEED_EC_KEY;
tls->key_size = AES128_KEYSIZE;
tls->MAC_size = SHA1_OUTSIZE;
}
- else { /* TLS_RSA_WITH_AES_256_CBC_SHA256 */
+ else
+ if (cipher == TLS_RSA_WITH_AES_256_CBC_SHA256) {
tls->key_size = AES256_KEYSIZE;
tls->MAC_size = SHA256_OUTSIZE;
}
+ else { /* TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 */
+ tls->flags |= NEED_EC_KEY | ENCRYPTION_AESGCM;
+ tls->key_size = AES128_KEYSIZE;
+ /* tls->MAC_size = 0; */
+ tls->IV_size = 4;
+ }
/* Handshake hash eventually destined to FINISHED record
* is sha256 regardless of cipher
* (at least for all ciphers defined by RFC5246).
* It's not sha1 for AES_128_CBC_SHA - only MAC is sha1, not this hash.
*/
+/* HANDSHAKE HASH:
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
@@ -1482,6 +1656,7 @@ static void get_server_hello(tls_state_t *tls)
hash_handshake(tls, "<< server hello hash:%s",
tls->inbuf + RECHDR_LEN, len
);
+ */
}
static void get_server_cert(tls_state_t *tls)
@@ -1548,7 +1723,7 @@ static void process_server_key(tls_state_t *tls, int len)
// 64523d6216cb94c43c9b20e377d8c52c55be6703fd6730a155930c705eaf3af6 //32bytes
//same about this item ^^^^^
-//seen from www.openbsd.org
+//seen from ftp.openbsd.org
//(which only accepts ECDHE-RSA-AESnnn-GCM-SHAnnn and ECDHE-RSA-CHACHA20-POLY1305 ciphers):
// 0c 000228 //SERVER_KEY_EXCHANGE, len
// 03 //curve_type: named curve
@@ -1572,6 +1747,7 @@ static void process_server_key(tls_state_t *tls, int len)
bb_error_msg_and_die("elliptic curve is not x25519");
memcpy(tls->hsd->ecc_pub_key32, keybuf + 4, 32);
+ tls->flags |= GOT_EC_KEY;
dbg("got eccPubKey\n");
}
@@ -1612,7 +1788,11 @@ static void send_client_key_exchange(tls_state_t *tls)
int premaster_size;
int len;
- if (tls->hsd->key_alg == KEY_ALG_RSA) {
+ if (!(tls->flags & NEED_EC_KEY)) {
+ /* RSA */
+ if (!(tls->flags & GOT_CERT_RSA_KEY_ALG))
+ bb_error_msg("server cert is not RSA");
+
tls_get_random(rsa_premaster, sizeof(rsa_premaster));
if (TLS_DEBUG_FIXED_SECRETS)
memset(rsa_premaster, 0x44, sizeof(rsa_premaster));
@@ -1636,10 +1816,13 @@ static void send_client_key_exchange(tls_state_t *tls)
premaster = rsa_premaster;
premaster_size = sizeof(rsa_premaster);
} else {
- /* KEY_ALG_ECDSA */
+ /* ECDHE */
static const uint8_t basepoint9[CURVE25519_KEYSIZE] = {9};
uint8_t privkey[CURVE25519_KEYSIZE]; //[32]
+ if (!(tls->flags & GOT_EC_KEY))
+ bb_error_msg("server did not provide EC key");
+
/* Generate random private key, see RFC 7748 */
tls_get_random(privkey, sizeof(privkey));
privkey[0] &= 0xf8;
@@ -1727,23 +1910,32 @@ static void send_client_key_exchange(tls_state_t *tls)
memcpy(&tmp64[32], &tls->hsd->client_and_server_rand32[0] , 32);
prf_hmac_sha256(/*tls,*/
- tls->client_write_MAC_key, 2 * (tls->MAC_size + tls->key_size),
+ tls->client_write_MAC_key, 2 * (tls->MAC_size + tls->key_size + tls->IV_size),
// also fills:
// server_write_MAC_key[]
// client_write_key[]
// server_write_key[]
+ // client_write_IV[]
+ // server_write_IV[]
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;
+ tls->client_write_IV = tls->server_write_key + tls->key_size;
+ tls->server_write_IV = tls->client_write_IV + tls->IV_size;
dump_hex("client_write_MAC_key:%s\n",
tls->client_write_MAC_key, tls->MAC_size
);
dump_hex("client_write_key:%s\n",
tls->client_write_key, tls->key_size
);
+ dump_hex("client_write_IV:%s\n",
+ tls->client_write_IV, tls->IV_size
+ );
+ aesgcm_setkey(tls->H, &tls->aes_encrypt, tls->client_write_key, tls->key_size);
+ aes_setkey(&tls->aes_decrypt, tls->server_write_key, tls->key_size);
}
}
@@ -1876,7 +2068,7 @@ void FAST_FUNC tls_handshake(tls_state_t *tls, const char *sni)
// client.
dbg("<< SERVER_KEY_EXCHANGE len:%u\n", len);
dump_raw_in("<< %s\n", tls->inbuf, RECHDR_LEN + len);
- if (tls->hsd->key_alg == KEY_ALG_ECDSA)
+ if (tls->flags & NEED_EC_KEY)
process_server_key(tls, len);
// read next handshake block
@@ -1922,18 +2114,22 @@ void FAST_FUNC tls_handshake(tls_state_t *tls, const char *sni)
if (len != 1 || memcmp(tls->inbuf, rec_CHANGE_CIPHER_SPEC, 6) != 0)
bad_record_die(tls, "switch to encrypted traffic", len);
dbg("<< CHANGE_CIPHER_SPEC\n");
+
if (CIPHER_ID1 == TLS_RSA_WITH_NULL_SHA256
&& tls->cipher_id == TLS_RSA_WITH_NULL_SHA256
) {
tls->min_encrypted_len_on_read = tls->MAC_size;
- } else {
- unsigned mac_blocks = (unsigned)(tls->MAC_size + AES_BLOCKSIZE-1) / AES_BLOCKSIZE;
+ } else
+ if (!(tls->flags & ENCRYPTION_AESGCM)) {
+ unsigned mac_blocks = (unsigned)(tls->MAC_size + AES_BLOCK_SIZE-1) / AES_BLOCK_SIZE;
/* all incoming packets now should be encrypted and have
* at least IV + (MAC padded to blocksize):
*/
- tls->min_encrypted_len_on_read = AES_BLOCKSIZE + (mac_blocks * AES_BLOCKSIZE);
- dbg("min_encrypted_len_on_read: %u", tls->min_encrypted_len_on_read);
+ tls->min_encrypted_len_on_read = AES_BLOCK_SIZE + (mac_blocks * AES_BLOCK_SIZE);
+ } else {
+ tls->min_encrypted_len_on_read = 8 + AES_BLOCK_SIZE;
}
+ dbg("min_encrypted_len_on_read: %u\n", tls->min_encrypted_len_on_read);
/* Get (encrypted) FINISHED from the server */
len = tls_xread_record(tls, "'server finished'");
diff --git a/networking/tls.h b/networking/tls.h
index 66d25ef..1d379c1 100644
--- a/networking/tls.h
+++ b/networking/tls.h
@@ -78,6 +78,8 @@ typedef int16_t int16;
#define PUBKEY_TYPE 0x01
#define PRIVKEY_TYPE 0x02
+#define AES_BLOCK_SIZE 16
+
void tls_get_random(void *buf, unsigned len);
#define matrixCryptoGetPrngData(buf, len, userPtr) (tls_get_random(buf, len), PS_SUCCESS)
@@ -96,5 +98,6 @@ void tls_get_random(void *buf, unsigned len);
#include "tls_pstm.h"
#include "tls_symmetric.h"
#include "tls_aes.h"
+#include "tls_aesgcm.h"
#include "tls_rsa.h"
#include "tls_fe.h"
diff --git a/networking/tls_aes.c b/networking/tls_aes.c
index c137442..4d2b689 100644
--- a/networking/tls_aes.c
+++ b/networking/tls_aes.c
@@ -340,8 +340,12 @@ static void aes_encrypt_1(unsigned astate[16], unsigned rounds, const uint32_t *
AddRoundKey(astate, RoundKey);
}
-#if 0 // UNUSED
-static void aes_encrypt_one_block(unsigned rounds, const uint32_t *RoundKey, const void *data, void *dst)
+void FAST_FUNC aes_setkey(struct tls_aes *aes, const void *key, unsigned key_len)
+{
+ aes->rounds = KeyExpansion(aes->key, key, key_len);
+}
+
+void FAST_FUNC aes_encrypt_one_block(struct tls_aes *aes, const void *data, void *dst)
{
unsigned astate[16];
unsigned i;
@@ -351,13 +355,12 @@ static void aes_encrypt_one_block(unsigned rounds, const uint32_t *RoundKey, con
for (i = 0; i < 16; i++)
astate[i] = pt[i];
- aes_encrypt_1(astate, rounds, RoundKey);
+ aes_encrypt_1(astate, aes->rounds, aes->key);
for (i = 0; i < 16; i++)
ct[i] = astate[i];
}
-#endif
-void aes_cbc_encrypt(const void *key, int klen, void *iv, const void *data, size_t len, void *dst)
+void FAST_FUNC aes_cbc_encrypt(const void *key, int klen, void *iv, const void *data, size_t len, void *dst)
{
uint32_t RoundKey[60];
uint8_t iv2[16];
@@ -420,7 +423,7 @@ static void aes_decrypt_one_block(unsigned rounds, const uint32_t *RoundKey, con
}
#endif
-void aes_cbc_decrypt(const void *key, int klen, void *iv, const void *data, size_t len, void *dst)
+void FAST_FUNC aes_cbc_decrypt(const void *key, int klen, void *iv, const void *data, size_t len, void *dst)
{
uint32_t RoundKey[60];
uint8_t iv2[16];
diff --git a/networking/tls_aes.h b/networking/tls_aes.h
index c679186..fc38817 100644
--- a/networking/tls_aes.h
+++ b/networking/tls_aes.h
@@ -6,5 +6,9 @@
* Selected few declarations for AES.
*/
-void aes_cbc_encrypt(const void *key, int klen, void *iv, const void *data, size_t len, void *dst);
-void aes_cbc_decrypt(const void *key, int klen, void *iv, const void *data, size_t len, void *dst);
+void aes_setkey(struct tls_aes *aes, const void *key, unsigned key_len) FAST_FUNC;
+
+void aes_encrypt_one_block(struct tls_aes *aes, const void *data, void *dst) FAST_FUNC;
+
+void aes_cbc_encrypt(const void *key, int klen, void *iv, const void *data, size_t len, void *dst) FAST_FUNC;
+void aes_cbc_decrypt(const void *key, int klen, void *iv, const void *data, size_t len, void *dst) FAST_FUNC;
diff --git a/networking/tls_aesgcm.c b/networking/tls_aesgcm.c
new file mode 100644
index 0000000..584cee9
--- /dev/null
+++ b/networking/tls_aesgcm.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2018 Denys Vlasenko
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+#include "tls.h"
+
+typedef uint8_t byte;
+typedef uint32_t word32;
+#define XMEMSET memset
+#define XMEMCPY memcpy
+
+#define TLS_MAJ 3
+#define TLS_MIN 3
+#define RECHDR_LEN 5
+#define OUTBUF_PFX (8 + AES_BLOCK_SIZE)
+
+void FAST_FUNC xorbuf(void* buf, const void* mask, unsigned count)
+{
+ word32 i;
+ byte* b = (byte*)buf;
+ const byte* m = (const byte*)mask;
+ for (i = 0; i < count; i++)
+ b[i] ^= m[i];
+}
+
+/* wolfssl-3.15.3/wolfcrypt/src/aes.c */
+
+static void FlattenSzInBits(byte* buf, word32 sz)
+{
+ /* Multiply the sz by 8 */
+ word32 szHi = (sz >> (8*sizeof(sz) - 3));
+ sz <<= 3;
+
+ /* copy over the words of the sz into the destination buffer */
+ buf[0] = (szHi >> 24) & 0xff;
+ buf[1] = (szHi >> 16) & 0xff;
+ buf[2] = (szHi >> 8) & 0xff;
+ buf[3] = szHi & 0xff;
+ buf[4] = (sz >> 24) & 0xff;
+ buf[5] = (sz >> 16) & 0xff;
+ buf[6] = (sz >> 8) & 0xff;
+ buf[7] = sz & 0xff;
+}
+
+static void RIGHTSHIFTX(byte* x)
+{
+ int i;
+ int carryOut = 0;
+ int carryIn = 0;
+ int borrow = x[15] & 0x01;
+
+ for (i = 0; i < AES_BLOCK_SIZE; i++) {
+ carryOut = x[i] & 0x01;
+ x[i] = (x[i] >> 1) | (carryIn ? 0x80 : 0);
+ carryIn = carryOut;
+ }
+ if (borrow) x[0] ^= 0xE1;
+}
+
+static void GMULT(byte* X, byte* Y)
+{
+ byte Z[AES_BLOCK_SIZE];
+ byte V[AES_BLOCK_SIZE];
+ int i, j;
+
+ XMEMSET(Z, 0, AES_BLOCK_SIZE);
+ XMEMCPY(V, X, AES_BLOCK_SIZE);
+ for (i = 0; i < AES_BLOCK_SIZE; i++)
+ {
+ byte y = Y[i];
+ for (j = 0; j < 8; j++)
+ {
+ if (y & 0x80) {
+ xorbuf(Z, V, AES_BLOCK_SIZE);
+ }
+
+ RIGHTSHIFTX(V);
+ y = y << 1;
+ }
+ }
+ XMEMCPY(X, Z, AES_BLOCK_SIZE);
+}
+
+void FAST_FUNC aesgcm_GHASH(byte* h, const byte* a, unsigned aSz, const byte* c,
+ unsigned cSz, byte* s, unsigned sSz)
+{
+ byte x[AES_BLOCK_SIZE];
+ byte scratch[AES_BLOCK_SIZE];
+ word32 blocks, partial;
+ //was: byte* h = aes->H;
+
+ XMEMSET(x, 0, AES_BLOCK_SIZE);
+
+ /* Hash in A, the Additional Authentication Data */
+ if (aSz != 0 && a != NULL) {
+ blocks = aSz / AES_BLOCK_SIZE;
+ partial = aSz % AES_BLOCK_SIZE;
+ while (blocks--) {
+ xorbuf(x, a, AES_BLOCK_SIZE);
+ GMULT(x, h);
+ a += AES_BLOCK_SIZE;
+ }
+ if (partial != 0) {
+ XMEMSET(scratch, 0, AES_BLOCK_SIZE);
+ XMEMCPY(scratch, a, partial);
+ xorbuf(x, scratch, AES_BLOCK_SIZE);
+ GMULT(x, h);
+ }
+ }
+
+ /* Hash in C, the Ciphertext */
+ if (cSz != 0 && c != NULL) {
+ blocks = cSz / AES_BLOCK_SIZE;
+ partial = cSz % AES_BLOCK_SIZE;
+ while (blocks--) {
+ xorbuf(x, c, AES_BLOCK_SIZE);
+ GMULT(x, h);
+ c += AES_BLOCK_SIZE;
+ }
+ if (partial != 0) {
+ XMEMSET(scratch, 0, AES_BLOCK_SIZE);
+ XMEMCPY(scratch, c, partial);
+ xorbuf(x, scratch, AES_BLOCK_SIZE);
+ GMULT(x, h);
+ }
+ }
+
+ /* Hash in the lengths of A and C in bits */
+ FlattenSzInBits(&scratch[0], aSz);
+ FlattenSzInBits(&scratch[8], cSz);
+ xorbuf(x, scratch, AES_BLOCK_SIZE);
+ GMULT(x, h);
+
+ /* Copy the result into s. */
+ XMEMCPY(s, x, sSz);
+}
+
+void FAST_FUNC aesgcm_setkey(uint8_t H[16], struct tls_aes *aes, const byte* key, unsigned len)
+{
+ byte iv[AES_BLOCK_SIZE];
+
+ aes_setkey(aes, key, len);
+
+ memset(iv, 0, AES_BLOCK_SIZE);
+ aes_encrypt_one_block(aes, iv, H);
+}
diff --git a/networking/tls_aesgcm.h b/networking/tls_aesgcm.h
new file mode 100644
index 0000000..d4cde01
--- /dev/null
+++ b/networking/tls_aesgcm.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2018 Denys Vlasenko
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+void xorbuf(void* buf, const void* mask, unsigned count) FAST_FUNC;
+
+void aesgcm_GHASH(uint8_t* h,
+ const uint8_t* a, unsigned aSz,
+ const uint8_t* c, unsigned cSz,
+ uint8_t* s, unsigned sSz
+) FAST_FUNC;
+
+void aesgcm_setkey(uint8_t H[16], struct tls_aes *aes, const uint8_t* key, unsigned len) FAST_FUNC;
diff --git a/networking/tls_fe.c b/networking/tls_fe.c
index dcb4146..f235082 100644
--- a/networking/tls_fe.c
+++ b/networking/tls_fe.c
@@ -554,7 +554,7 @@ static void xc_double(byte *x3, byte *z3,
fe_mul_c(z3, x1sq, 4);
}
-void curve25519(byte *result, const byte *e, const byte *q)
+void FAST_FUNC curve25519(byte *result, const byte *e, const byte *q)
{
int i;
diff --git a/networking/tls_fe.h b/networking/tls_fe.h
index bd2f2b3..fe8cff2 100644
--- a/networking/tls_fe.h
+++ b/networking/tls_fe.h
@@ -4,4 +4,4 @@
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
#define CURVE25519_KEYSIZE 32
-void curve25519(uint8_t *result, const uint8_t *e, const uint8_t *q);
+void curve25519(uint8_t *result, const uint8_t *e, const uint8_t *q) FAST_FUNC;
diff --git a/networking/tls_rsa.c b/networking/tls_rsa.c
index 60c5424..631397e 100644
--- a/networking/tls_rsa.c
+++ b/networking/tls_rsa.c
@@ -179,7 +179,7 @@ done:
return res;
}
-int32 psRsaEncryptPub(psPool_t *pool, psRsaKey_t *key,
+int32 FAST_FUNC psRsaEncryptPub(psPool_t *pool, psRsaKey_t *key,
unsigned char *in, uint32 inlen,
unsigned char *out, uint32 outlen, void *data)
{
diff --git a/networking/tls_rsa.h b/networking/tls_rsa.h
index c464ed5..f42923f 100644
--- a/networking/tls_rsa.h
+++ b/networking/tls_rsa.h
@@ -17,4 +17,4 @@ typedef struct {
psRsaEncryptPub( key, in, inlen, out, outlen)
int32 psRsaEncryptPub(psPool_t *pool, psRsaKey_t *key,
unsigned char *in, uint32 inlen,
- unsigned char *out, uint32 outlen, void *data);
+ unsigned char *out, uint32 outlen, void *data) FAST_FUNC;
generated by cgit v1.1 at 2024-12-27 11:21:12 +0000