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wpa_supplicant: Fix IOT issue with latest freeradius

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Fix inter operability issue with freeradius version 3.0.21
and openssl 1.1.1f when internal tls client is used which
requires extension elements in client hello.

closes https://github.com/espressif/esp-idf/issues/5273
closes https://github.com/espressif/esp-idf/issues/5627
This commit is contained in:
kapil.gupta 2020-07-23 22:42:37 +05:30 committed by bot
parent 59347d6a63
commit 50b4cf9286
5 changed files with 292 additions and 9 deletions
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6
components/wpa_supplicant/src/tls/tlsv1_client.c
View File

@ -706,18 +706,16 @@ int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
if (data == NULL || data_len == 0)
return 0;
pos = conn->client_hello_ext = os_malloc(6 + data_len);
pos = conn->client_hello_ext = os_malloc(4 + data_len);
if (pos == NULL)
return -1;
WPA_PUT_BE16(pos, 4 + data_len);
pos += 2;
WPA_PUT_BE16(pos, ext_type);
pos += 2;
WPA_PUT_BE16(pos, data_len);
pos += 2;
os_memcpy(pos, data, data_len);
conn->client_hello_ext_len = 6 + data_len;
conn->client_hello_ext_len = 4 + data_len;
if (ext_type == TLS_EXT_PAC_OPAQUE) {
conn->session_ticket_included = 1;

67
components/wpa_supplicant/src/tls/tlsv1_client_read.c
View File

@ -409,9 +409,11 @@ static int tls_process_certificate(struct tlsv1_client *conn, u8 ct,
static int tlsv1_process_diffie_hellman(struct tlsv1_client *conn,
const u8 *buf, size_t len)
const u8 *buf, size_t len,
tls_key_exchange key_exchange)
{
const u8 *pos, *end;
const u8 *pos, *end, *server_params, *server_params_end;
u8 alert;
tlsv1_client_free_dh(conn);
@ -420,6 +422,7 @@ static int tlsv1_process_diffie_hellman(struct tlsv1_client *conn,
if (end - pos < 3)
goto fail;
server_params = pos;
conn->dh_p_len = WPA_GET_BE16(pos);
pos += 2;
if (conn->dh_p_len == 0 || end - pos < (int) conn->dh_p_len) {
@ -464,6 +467,60 @@ static int tlsv1_process_diffie_hellman(struct tlsv1_client *conn,
pos += conn->dh_ys_len;
wpa_hexdump(MSG_DEBUG, "TLSv1: DH Ys (server's public value)",
conn->dh_ys, conn->dh_ys_len);
server_params_end = pos;
if (key_exchange == TLS_KEY_X_DHE_RSA) {
u8 hash[64];
int hlen;
if (conn->rl.tls_version == TLS_VERSION_1_2) {
#ifdef CONFIG_TLSV12
/*
* RFC 5246, 4.7:
* TLS v1.2 adds explicit indication of the used
* signature and hash algorithms.
*
* struct {
* HashAlgorithm hash;
* SignatureAlgorithm signature;
* } SignatureAndHashAlgorithm;
*/
if (end - pos < 2)
goto fail;
if ((pos[0] != TLS_HASH_ALG_SHA256) ||
pos[1] != TLS_SIGN_ALG_RSA) {
wpa_printf(MSG_DEBUG, "TLSv1.2: Unsupported hash(%u)/signature(%u) algorithm",
pos[0], pos[1]);
goto fail;
}
hlen = tlsv12_key_x_server_params_hash(
conn->rl.tls_version, pos[0],
conn->client_random,
conn->server_random, server_params,
server_params_end - server_params, hash);
pos += 2;
#else /* CONFIG_TLSV12 */
goto fail;
#endif /* CONFIG_TLSV12 */
} else {
hlen = tls_key_x_server_params_hash(
conn->rl.tls_version, conn->client_random,
conn->server_random, server_params,
server_params_end - server_params, hash);
}
if (hlen < 0)
goto fail;
wpa_hexdump(MSG_MSGDUMP, "TLSv1: ServerKeyExchange hash",
hash, hlen);
if (tls_verify_signature(conn->rl.tls_version,
conn->server_rsa_key,
hash, hlen, pos, end - pos,
&alert) < 0)
goto fail;
}
return 0;
@ -542,8 +599,10 @@ static int tls_process_server_key_exchange(struct tlsv1_client *conn, u8 ct,
wpa_hexdump(MSG_DEBUG, "TLSv1: ServerKeyExchange", pos, len);
suite = tls_get_cipher_suite(conn->rl.cipher_suite);
if (suite && suite->key_exchange == TLS_KEY_X_DH_anon) {
if (tlsv1_process_diffie_hellman(conn, pos, len) < 0) {
if (suite && (suite->key_exchange == TLS_KEY_X_DH_anon ||
suite->key_exchange == TLS_KEY_X_DHE_RSA)) {
if (tlsv1_process_diffie_hellman(conn, pos, len,
suite->key_exchange) < 0) {
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECODE_ERROR);
return -1;

33
components/wpa_supplicant/src/tls/tlsv1_client_write.c
View File

@ -48,6 +48,7 @@ u8 * tls_send_client_hello(struct tlsv1_client *conn, size_t *out_len)
u8 *hello, *end, *pos, *hs_length, *hs_start, *rhdr;
struct os_time now;
size_t len, i;
u8 *ext_start;
wpa_printf(MSG_DEBUG, "TLSv1: Send ClientHello");
*out_len = 0;
@ -62,7 +63,7 @@ u8 * tls_send_client_hello(struct tlsv1_client *conn, size_t *out_len)
wpa_hexdump(MSG_MSGDUMP, "TLSv1: client_random",
conn->client_random, TLS_RANDOM_LEN);
len = 100 + conn->num_cipher_suites * 2 + conn->client_hello_ext_len;
len = 150 + conn->num_cipher_suites * 2 + conn->client_hello_ext_len;
hello = os_malloc(len);
if (hello == NULL)
return NULL;
@ -102,12 +103,42 @@ u8 * tls_send_client_hello(struct tlsv1_client *conn, size_t *out_len)
*pos++ = 1;
*pos++ = TLS_COMPRESSION_NULL;
/* Extension */
ext_start = pos;
pos += 2;
#ifdef CONFIG_TLSV12
if (conn->rl.tls_version >= TLS_VERSION_1_2) {
/*
* Add signature_algorithms extension since we support only
* SHA256 (and not the default SHA1) with TLSv1.2.
*/
/* ExtensionsType extension_type = signature_algorithms(13) */
WPA_PUT_BE16(pos, TLS_EXT_SIGNATURE_ALGORITHMS);
pos += 2;
/* opaque extension_data<0..2^16-1> length */
WPA_PUT_BE16(pos, 4);
pos += 2;
/* supported_signature_algorithms<2..2^16-2> length */
WPA_PUT_BE16(pos, 2);
pos += 2;
/* supported_signature_algorithms */
*pos++ = TLS_HASH_ALG_SHA256;
*pos++ = TLS_SIGN_ALG_RSA;
}
#endif /* CONFIG_TLSV12 */
if (conn->client_hello_ext) {
os_memcpy(pos, conn->client_hello_ext,
conn->client_hello_ext_len);
pos += conn->client_hello_ext_len;
}
if (pos == ext_start + 2)
pos -= 2; /* no extensions */
else
WPA_PUT_BE16(ext_start, pos - ext_start - 2);
WPA_PUT_BE24(hs_length, pos - hs_length - 3);
tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);

182
components/wpa_supplicant/src/tls/tlsv1_common.c
View File

@ -9,6 +9,7 @@
#include "utils/includes.h"
#include "utils/common.h"
#include "crypto/md5.h"
#include "crypto/sha1.h"
#include "crypto/sha256.h"
#include "tls/tls.h"
@ -333,3 +334,184 @@ int tls_prf(u16 ver, const u8 *secret, size_t secret_len, const char *label,
return tls_prf_sha1_md5(secret, secret_len, label, seed, seed_len, out,
outlen);
}
#ifdef CONFIG_TLSV12
int tlsv12_key_x_server_params_hash(u16 tls_version, u8 hash_alg,
const u8 *client_random,
const u8 *server_random,
const u8 *server_params,
size_t server_params_len, u8 *hash)
{
size_t hlen;
struct crypto_hash *ctx;
enum crypto_hash_alg alg;
switch (hash_alg) {
case TLS_HASH_ALG_SHA256:
alg = CRYPTO_HASH_ALG_SHA256;
hlen = SHA256_MAC_LEN;
break;
default:
return -1;
}
ctx = crypto_hash_init(alg, NULL, 0);
if (ctx == NULL)
return -1;
crypto_hash_update(ctx, client_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_params, server_params_len);
if (crypto_hash_finish(ctx, hash, &hlen) < 0)
return -1;
return hlen;
}
#endif /* CONFIG_TLSV12 */
int tls_key_x_server_params_hash(u16 tls_version, const u8 *client_random,
const u8 *server_random,
const u8 *server_params,
size_t server_params_len, u8 *hash)
{
u8 *hpos;
size_t hlen;
struct crypto_hash *ctx;
hpos = hash;
ctx = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL, 0);
if (ctx == NULL)
return -1;
crypto_hash_update(ctx, client_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_params, server_params_len);
hlen = MD5_MAC_LEN;
if (crypto_hash_finish(ctx, hash, &hlen) < 0)
return -1;
hpos += hlen;
ctx = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL, 0);
if (ctx == NULL)
return -1;
crypto_hash_update(ctx, client_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_params, server_params_len);
hlen = hash + sizeof(hash) - hpos;
if (crypto_hash_finish(ctx, hpos, &hlen) < 0)
return -1;
hpos += hlen;
return hpos - hash;
}
int tls_verify_signature(u16 tls_version, struct crypto_public_key *pk,
const u8 *data, size_t data_len,
const u8 *pos, size_t len, u8 *alert)
{
u8 *buf;
const u8 *end = pos + len;
const u8 *decrypted;
u16 slen;
size_t buflen;
if (end - pos < 2) {
*alert = TLS_ALERT_DECODE_ERROR;
return -1;
}
slen = WPA_GET_BE16(pos);
pos += 2;
if (end - pos < slen) {
*alert = TLS_ALERT_DECODE_ERROR;
return -1;
}
if (end - pos > slen) {
wpa_hexdump(MSG_MSGDUMP, "Additional data after Signature",
pos + slen, end - pos - slen);
end = pos + slen;
}
wpa_hexdump(MSG_MSGDUMP, "TLSv1: Signature", pos, end - pos);
if (pk == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: No public key to verify signature");
*alert = TLS_ALERT_INTERNAL_ERROR;
return -1;
}
buflen = end - pos;
buf = os_malloc(end - pos);
if (buf == NULL) {
*alert = TLS_ALERT_INTERNAL_ERROR;
return -1;
}
if (crypto_public_key_decrypt_pkcs1(pk, pos, end - pos, buf, &buflen) <
0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to decrypt signature");
os_free(buf);
*alert = TLS_ALERT_DECRYPT_ERROR;
return -1;
}
decrypted = buf;
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Decrypted Signature",
decrypted, buflen);
#ifdef CONFIG_TLSV12
if (tls_version >= TLS_VERSION_1_2) {
/*
* RFC 3447, A.2.4 RSASSA-PKCS1-v1_5
*
* DigestInfo ::= SEQUENCE {
* digestAlgorithm DigestAlgorithm,
* digest OCTET STRING
* }
*
* SHA-256 OID: sha256WithRSAEncryption ::= {pkcs-1 11}
*
* DER encoded DigestInfo for SHA256 per RFC 3447:
* 30 31 30 0d 06 09 60 86 48 01 65 03 04 02 01 05 00 04 20 ||
* H
*/
if (buflen >= 19 + 32 &&
os_memcmp(buf, "\x30\x31\x30\x0d\x06\x09\x60\x86\x48\x01"
"\x65\x03\x04\x02\x01\x05\x00\x04\x20", 19) == 0)
{
wpa_printf(MSG_DEBUG, "TLSv1.2: DigestAlgorithm = SHA-256");
decrypted = buf + 19;
buflen -= 19;
} else if (buflen >= 19 + 48 &&
os_memcmp(buf, "\x30\x41\x30\x0d\x06\x09\x60\x86\x48\x01"
"\x65\x03\x04\x02\x02\x05\x00\x04\x30", 19) == 0)
{
wpa_printf(MSG_DEBUG, "TLSv1.2: DigestAlgorithm = SHA-384");
decrypted = buf + 19;
buflen -= 19;
} else if (buflen >= 19 + 64 &&
os_memcmp(buf, "\x30\x51\x30\x0d\x06\x09\x60\x86\x48\x01"
"\x65\x03\x04\x02\x03\x05\x00\x04\x40", 19) == 0)
{
wpa_printf(MSG_DEBUG, "TLSv1.2: DigestAlgorithm = SHA-512");
decrypted = buf + 19;
buflen -= 19;
} else {
wpa_printf(MSG_DEBUG, "TLSv1.2: Unrecognized DigestInfo");
os_free(buf);
*alert = TLS_ALERT_DECRYPT_ERROR;
return -1;
}
}
#endif /* CONFIG_TLSV12 */
if (buflen != data_len ||
os_memcmp_const(decrypted, data, data_len) != 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Invalid Signature in CertificateVerify - did not match calculated hash");
os_free(buf);
*alert = TLS_ALERT_DECRYPT_ERROR;
return -1;
}
os_free(buf);
return 0;
}

13
components/wpa_supplicant/src/tls/tlsv1_common.h
View File

@ -169,6 +169,7 @@ enum {
#define TLS_EXT_TRUSTED_CA_KEYS 3 /* RFC 4366 */
#define TLS_EXT_TRUNCATED_HMAC 4 /* RFC 4366 */
#define TLS_EXT_STATUS_REQUEST 5 /* RFC 4366 */
#define TLS_EXT_SIGNATURE_ALGORITHMS 13 /* RFC 5246 */
#define TLS_EXT_SESSION_TICKET 35 /* RFC 4507 */
#define TLS_EXT_PAC_OPAQUE TLS_EXT_SESSION_TICKET /* EAP-FAST terminology */
@ -257,5 +258,17 @@ int tls_version_ok(u16 ver);
const char * tls_version_str(u16 ver);
int tls_prf(u16 ver, const u8 *secret, size_t secret_len, const char *label,
const u8 *seed, size_t seed_len, u8 *out, size_t outlen);
int tlsv12_key_x_server_params_hash(u16 tls_version, u8 hash_Alg,
const u8 *client_random,
const u8 *server_random,
const u8 *server_params,
size_t server_params_len, u8 *hash);
int tls_key_x_server_params_hash(u16 tls_version, const u8 *client_random,
const u8 *server_random,
const u8 *server_params,
size_t server_params_len, u8 *hash);
int tls_verify_signature(u16 tls_version, struct crypto_public_key *pk,
const u8 *data, size_t data_len,
const u8 *pos, size_t len, u8 *alert);
#endif /* TLSV1_COMMON_H */