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Merge branch 'bugfix/fix_supplicant_tlsv12' into 'master'

Browse Source 
wpa_supplicant: Fix wpa_supplicant TLS 1.2 issues

Closes WIFI-2003

See merge request espressif/esp-idf!8147
This commit is contained in:
Jiang Jiang Jian 2020-04-02 12:17:59 +08:00
commit 037ad6f64e
4 changed files with 85 additions and 13 deletions
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3
components/wpa_supplicant/CMakeLists.txt
View File

@ -14,6 +14,7 @@ set(srcs "port/os_xtensa.c"
"src/crypto/aes-unwrap.c"
"src/crypto/aes-wrap.c"
"src/crypto/aes-omac1.c"
"src/crypto/sha256-tlsprf.c"
"src/crypto/bignum.c"
"src/crypto/ccmp.c"
"src/crypto/crypto_mbedtls.c"
@ -111,4 +112,6 @@ target_compile_definitions(${COMPONENT_LIB} PRIVATE
CONFIG_ECC
CONFIG_IEEE80211W
CONFIG_WPA3_SAE
CONFIG_TLSV12
CONFIG_SHA256
)

26
components/wpa_supplicant/src/crypto/crypto_internal.c
View File

@ -73,7 +73,7 @@ struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
case CRYPTO_HASH_ALG_SHA256:
#ifdef USE_MBEDTLS_CRYPTO
mbedtls_sha256_init(&ctx->u.sha256);
mbedtls_sha256_starts(&ctx->u.sha256, 0);
mbedtls_sha256_starts_ret(&ctx->u.sha256, 0);
#else /* USE_MBEDTLS_CRYPTO */
sha256_init(&ctx->u.sha256);
#endif /* USE_MBEDTLS_CRYPTO */
@ -122,9 +122,9 @@ struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
if (key_len > sizeof(k_pad)) {
#ifdef USE_MBEDTLS_CRYPTO
mbedtls_sha256_init(&ctx->u.sha256);
mbedtls_sha256_starts(&ctx->u.sha256, 0);
mbedtls_sha256_update(&ctx->u.sha256, key, key_len);
mbedtls_sha256_finish(&ctx->u.sha256, tk);
mbedtls_sha256_starts_ret(&ctx->u.sha256, 0);
mbedtls_sha256_update_ret(&ctx->u.sha256, key, key_len);
mbedtls_sha256_finish_ret(&ctx->u.sha256, tk);
mbedtls_sha256_free(&ctx->u.sha256);
#else /* USE_MBEDTLS_CRYPTO */
sha256_init(&ctx->u.sha256);
@ -144,8 +144,8 @@ struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
k_pad[i] ^= 0x36;
#ifdef USE_MBEDTLS_CRYPTO
mbedtls_sha256_init(&ctx->u.sha256);
mbedtls_sha256_starts(&ctx->u.sha256, 0);
mbedtls_sha256_update(&ctx->u.sha256, k_pad, sizeof(k_pad));
mbedtls_sha256_starts_ret(&ctx->u.sha256, 0);
mbedtls_sha256_update_ret(&ctx->u.sha256, k_pad, sizeof(k_pad));
#else /* USE_MBEDTLS_CRYPTO */
sha256_init(&ctx->u.sha256);
sha256_process(&ctx->u.sha256, k_pad, sizeof(k_pad));
@ -179,7 +179,7 @@ void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len)
case CRYPTO_HASH_ALG_SHA256:
case CRYPTO_HASH_ALG_HMAC_SHA256:
#ifdef USE_MBEDTLS_CRYPTO
mbedtls_sha256_update(&ctx->u.sha256, data, len);
mbedtls_sha256_update_ret(&ctx->u.sha256, data, len);
#else /* USE_MBEDTLS_CRYPTO */
sha256_process(&ctx->u.sha256, data, len);
#endif /* USE_MBEDTLS_CRYPTO */
@ -232,7 +232,7 @@ int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
}
*len = 32;
#ifdef USE_MBEDTLS_CRYPTO
mbedtls_sha256_finish(&ctx->u.sha256, mac);
mbedtls_sha256_finish_ret(&ctx->u.sha256, mac);
mbedtls_sha256_free(&ctx->u.sha256);
#else /* USE_MBEDTLS_CRYPTO */
sha256_done(&ctx->u.sha256, mac);
@ -289,7 +289,7 @@ int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
*len = 32;
#ifdef USE_MBEDTLS_CRYPTO
mbedtls_sha256_finish(&ctx->u.sha256, mac);
mbedtls_sha256_finish_ret(&ctx->u.sha256, mac);
mbedtls_sha256_free(&ctx->u.sha256);
#else /* USE_MBEDTLS_CRYPTO */
sha256_done(&ctx->u.sha256, mac);
@ -302,10 +302,10 @@ int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
k_pad[i] ^= 0x5c;
#ifdef USE_MBEDTLS_CRYPTO
mbedtls_sha256_init(&ctx->u.sha256);
mbedtls_sha256_starts(&ctx->u.sha256, 0);
mbedtls_sha256_update(&ctx->u.sha256, k_pad, sizeof(k_pad));
mbedtls_sha256_update(&ctx->u.sha256, mac, 32);
mbedtls_sha256_finish(&ctx->u.sha256, mac);
mbedtls_sha256_starts_ret(&ctx->u.sha256, 0);
mbedtls_sha256_update_ret(&ctx->u.sha256, k_pad, sizeof(k_pad));
mbedtls_sha256_update_ret(&ctx->u.sha256, mac, 32);
mbedtls_sha256_finish_ret(&ctx->u.sha256, mac);
mbedtls_sha256_free(&ctx->u.sha256);
#else /* USE_MBEDTLS_CRYPTO */
sha256_init(&ctx->u.sha256);

66
components/wpa_supplicant/src/crypto/sha256-tlsprf.c Normal file
View File

@ -0,0 +1,66 @@
/*
* TLS PRF P_SHA256
* Copyright (c) 2011, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "sha256.h"
/**
* tls_prf_sha256 - Pseudo-Random Function for TLS v1.2 (P_SHA256, RFC 5246)
* @secret: Key for PRF
* @secret_len: Length of the key in bytes
* @label: A unique label for each purpose of the PRF
* @seed: Seed value to bind into the key
* @seed_len: Length of the seed
* @out: Buffer for the generated pseudo-random key
* @outlen: Number of bytes of key to generate
* Returns: 0 on success, -1 on failure.
*
* This function is used to derive new, cryptographically separate keys from a
* given key in TLS. This PRF is defined in RFC 2246, Chapter 5.
*/
void tls_prf_sha256(const u8 *secret, size_t secret_len, const char *label,
const u8 *seed, size_t seed_len, u8 *out, size_t outlen)
{
size_t clen;
u8 A[SHA256_MAC_LEN];
u8 P[SHA256_MAC_LEN];
size_t pos;
const unsigned char *addr[3];
size_t len[3];
addr[0] = A;
len[0] = SHA256_MAC_LEN;
addr[1] = (unsigned char *) label;
len[1] = os_strlen(label);
addr[2] = seed;
len[2] = seed_len;
/*
* RFC 5246, Chapter 5
* A(0) = seed, A(i) = HMAC(secret, A(i-1))
* P_hash = HMAC(secret, A(1) + seed) + HMAC(secret, A(2) + seed) + ..
* PRF(secret, label, seed) = P_SHA256(secret, label + seed)
*/
hmac_sha256_vector(secret, secret_len, 2, &addr[1], &len[1], A);
pos = 0;
while (pos < outlen) {
hmac_sha256_vector(secret, secret_len, 3, addr, len, P);
hmac_sha256(secret, secret_len, A, SHA256_MAC_LEN, A);
clen = outlen - pos;
if (clen > SHA256_MAC_LEN)
clen = SHA256_MAC_LEN;
os_memcpy(out + pos, P, clen);
pos += clen;
}
}

3
components/wpa_supplicant/src/crypto/sha256.h
View File

@ -26,5 +26,8 @@ int sha256_prf(const u8 *key, size_t key_len, const char *label,
int sha256_prf_bits(const u8 *key, size_t key_len, const char *label,
const u8 *data, size_t data_len, u8 *buf,
size_t buf_len_bits);
void tls_prf_sha256(const u8 *secret, size_t secret_len,
const char *label, const u8 *seed, size_t seed_len,
u8 *out, size_t outlen);
#endif /* SHA256_H */