Esempio n. 1
0
/*
 * Generates the mac for the Finished message. Returns the length of the MAC or
 * 0 on error.
 */
size_t tls13_final_finish_mac(SSL *s, const char *str, size_t slen,
                             unsigned char *out)
{
    const EVP_MD *md = ssl_handshake_md(s);
    unsigned char hash[EVP_MAX_MD_SIZE];
    size_t hashlen, ret = 0;
    EVP_PKEY *key = NULL;
    EVP_MD_CTX *ctx = EVP_MD_CTX_new();

    if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
        /* SSLfatal() already called */
        goto err;
    }

    if (str == s->method->ssl3_enc->server_finished_label) {
        key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
                                           s->server_finished_secret, hashlen);
    } else if (SSL_IS_FIRST_HANDSHAKE(s)) {
        key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
                                           s->client_finished_secret, hashlen);
    } else {
        unsigned char finsecret[EVP_MAX_MD_SIZE];

        if (!tls13_derive_finishedkey(s, ssl_handshake_md(s),
                                      s->client_app_traffic_secret,
                                      finsecret, hashlen))
            goto err;

        key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL, finsecret,
                                           hashlen);
        OPENSSL_cleanse(finsecret, sizeof(finsecret));
    }

    if (key == NULL
            || ctx == NULL
            || EVP_DigestSignInit(ctx, NULL, md, NULL, key) <= 0
            || EVP_DigestSignUpdate(ctx, hash, hashlen) <= 0
            || EVP_DigestSignFinal(ctx, out, &hashlen) <= 0) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_FINAL_FINISH_MAC,
                 ERR_R_INTERNAL_ERROR);
        goto err;
    }

    ret = hashlen;
 err:
    EVP_PKEY_free(key);
    EVP_MD_CTX_free(ctx);
    return ret;
}
Esempio n. 2
0
int ssl3_digest_cached_records(SSL *s, int keep)
{
    const EVP_MD *md;
    long hdatalen;
    void *hdata;

    if (s->s3->handshake_dgst == NULL) {
        hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
        if (hdatalen <= 0) {
            SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
            return 0;
        }

        s->s3->handshake_dgst = EVP_MD_CTX_new();
        if (s->s3->handshake_dgst == NULL) {
            SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_MALLOC_FAILURE);
            return 0;
        }

        md = ssl_handshake_md(s);
        if (   md == NULL
            || !EVP_DigestInit_ex(s->s3->handshake_dgst, md, NULL)
            || !EVP_DigestUpdate(s->s3->handshake_dgst, hdata, hdatalen))
        {
            SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_INTERNAL_ERROR);
            return 0;
        }
    }
    if (keep == 0) {
        BIO_free(s->s3->handshake_buffer);
        s->s3->handshake_buffer = NULL;
    }

    return 1;
}
Esempio n. 3
0
/*
 * Given the handshake secret |prev| of length |prevlen| generate the master
 * secret and store its length in |*secret_size|. Returns 1 on success  0 on
 * failure.
 */
int tls13_generate_master_secret(SSL *s, unsigned char *out,
                                 unsigned char *prev, size_t prevlen,
                                 size_t *secret_size)
{
    *secret_size = EVP_MD_size(ssl_handshake_md(s));
    return tls13_generate_secret(s, prev, NULL, 0, out);
}
Esempio n. 4
0
/*
 * Generates the mac for the Finished message. Returns the length of the MAC or
 * 0 on error.
 */
size_t tls13_final_finish_mac(SSL *s, const char *str, size_t slen,
                             unsigned char *out)
{
    const EVP_MD *md = ssl_handshake_md(s);
    unsigned char hash[EVP_MAX_MD_SIZE];
    size_t hashlen, ret = 0;
    EVP_PKEY *key = NULL;
    EVP_MD_CTX *ctx = EVP_MD_CTX_new();

    if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen))
        goto err;

    if (str == s->method->ssl3_enc->server_finished_label)
        key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
                                   s->server_finished_secret, hashlen);
    else
        key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
                                   s->client_finished_secret, hashlen);

    if (key == NULL
            || ctx == NULL
            || EVP_DigestSignInit(ctx, NULL, md, NULL, key) <= 0
            || EVP_DigestSignUpdate(ctx, hash, hashlen) <= 0
            || EVP_DigestSignFinal(ctx, out, &hashlen) <= 0)
        goto err;

    ret = hashlen;
 err:
    EVP_PKEY_free(key);
    EVP_MD_CTX_free(ctx);
    return ret;
}
Esempio n. 5
0
/*
 * Given an input secret |insecret| of length |insecretlen| generate the
 * handshake secret. This requires the early secret to already have been
 * generated. Returns 1 on success  0 on failure.
 */
int tls13_generate_handshake_secret(SSL *s, const unsigned char *insecret,
                                size_t insecretlen)
{
    return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret,
                                 insecret, insecretlen,
                                 (unsigned char *)&s->handshake_secret);
}
Esempio n. 6
0
/*
 * Given a |secret| generate an |iv| of length |ivlen| bytes. Returns 1 on
 * success  0 on failure.
 */
int tls13_derive_iv(SSL *s, const unsigned char *secret, unsigned char *iv,
                    size_t ivlen)
{
    static const unsigned char ivlabel[] = "iv";

    return tls13_hkdf_expand(s, ssl_handshake_md(s), secret, ivlabel,
                             sizeof(ivlabel) - 1, NULL, iv, ivlen);
}
Esempio n. 7
0
/*
 * Given a |secret| generate a |key| of length |keylen| bytes. Returns 1 on
 * success  0 on failure.
 */
int tls13_derive_key(SSL *s, const unsigned char *secret, unsigned char *key,
                     size_t keylen)
{
    static const unsigned char keylabel[] = "key";

    return tls13_hkdf_expand(s, ssl_handshake_md(s), secret, keylabel,
                             sizeof(keylabel) - 1, NULL, key, keylen);
}
Esempio n. 8
0
/*
 * Given an input secret |insecret| of length |insecretlen| generate the
 * handshake secret. This requires the early secret to already have been
 * generated. Returns 1 on success  0 on failure.
 */
int tls13_generate_handshake_secret(SSL *s, const unsigned char *insecret,
                                size_t insecretlen)
{
    /* Calls SSLfatal() if required */
    return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret,
                                 insecret, insecretlen,
                                 (unsigned char *)&s->handshake_secret);
}
Esempio n. 9
0
/*
 * Given the handshake secret |prev| of length |prevlen| generate the master
 * secret and store its length in |*secret_size|. Returns 1 on success  0 on
 * failure.
 */
int tls13_generate_master_secret(SSL *s, unsigned char *out,
                                 unsigned char *prev, size_t prevlen,
                                 size_t *secret_size)
{
    const EVP_MD *md = ssl_handshake_md(s);

    *secret_size = EVP_MD_size(md);
    /* Calls SSLfatal() if required */
    return tls13_generate_secret(s, md, prev, NULL, 0, out);
}
Esempio n. 10
0
int tls13_update_key(SSL *s, int sending)
{
    static const unsigned char application_traffic[] = "traffic upd";
    const EVP_MD *md = ssl_handshake_md(s);
    size_t hashlen = EVP_MD_size(md);
    unsigned char *insecret, *iv;
    unsigned char secret[EVP_MAX_MD_SIZE];
    EVP_CIPHER_CTX *ciph_ctx;
    int ret = 0;

    if (s->server == sending)
        insecret = s->server_app_traffic_secret;
    else
        insecret = s->client_app_traffic_secret;

    if (sending) {
        s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
        iv = s->write_iv;
        ciph_ctx = s->enc_write_ctx;
        RECORD_LAYER_reset_write_sequence(&s->rlayer);
    } else {
        iv = s->read_iv;
        ciph_ctx = s->enc_read_ctx;
        RECORD_LAYER_reset_read_sequence(&s->rlayer);
    }

    if (!derive_secret_key_and_iv(s, sending, ssl_handshake_md(s),
                                  s->s3->tmp.new_sym_enc, insecret, NULL,
                                  application_traffic,
                                  sizeof(application_traffic) - 1, secret, iv,
                                  ciph_ctx)) {
        /* SSLfatal() already called */
        goto err;
    }

    memcpy(insecret, secret, hashlen);

    s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
    ret = 1;
 err:
    OPENSSL_cleanse(secret, sizeof(secret));
    return ret;
}
Esempio n. 11
0
/*
 * Given a |secret|; a |label| of length |labellen|; and a |hash| of the
 * handshake messages, derive a new secret |outlen| bytes long and store it in
 * the location pointed to be |out|. The |hash| value may be NULL. Returns 1 on
 * success  0 on failure.
 */
static int tls13_hkdf_expand(SSL *s, const unsigned char *secret,
                             const unsigned char *label, size_t labellen,
                             const unsigned char *hash,
                             unsigned char *out, size_t outlen)
{
    const unsigned char label_prefix[] = "TLS 1.3, ";
    const EVP_MD *md = ssl_handshake_md(s);
    EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
    int ret;
    size_t hkdflabellen;
    size_t hashlen;
    /*
     * 2 bytes for length of whole HkdfLabel + 1 byte for length of combined
     * prefix and label + bytes for the label itself + bytes for the hash
     */
    unsigned char hkdflabel[sizeof(uint16_t) + sizeof(uint8_t) +
                            + sizeof(label_prefix) + TLS13_MAX_LABEL_LEN
                            + EVP_MAX_MD_SIZE];
    WPACKET pkt;

    if (pctx == NULL)
        return 0;

    hashlen = EVP_MD_size(md);

    if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0)
            || !WPACKET_put_bytes_u16(&pkt, outlen)
            || !WPACKET_start_sub_packet_u8(&pkt)
            || !WPACKET_memcpy(&pkt, label_prefix, sizeof(label_prefix) - 1)
            || !WPACKET_memcpy(&pkt, label, labellen)
            || !WPACKET_close(&pkt)
            || !WPACKET_sub_memcpy_u8(&pkt, hash, (hash == NULL) ? 0 : hashlen)
            || !WPACKET_get_total_written(&pkt, &hkdflabellen)
            || !WPACKET_finish(&pkt)) {
        WPACKET_cleanup(&pkt);
        return 0;
    }

    ret = EVP_PKEY_derive_init(pctx) <= 0
            || EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXPAND_ONLY)
               <= 0
            || EVP_PKEY_CTX_set_hkdf_md(pctx, md) <= 0
            || EVP_PKEY_CTX_set1_hkdf_key(pctx, secret, hashlen) <= 0
            || EVP_PKEY_CTX_add1_hkdf_info(pctx, hkdflabel, hkdflabellen) <= 0
            || EVP_PKEY_derive(pctx, out, &outlen) <= 0;

    EVP_PKEY_CTX_free(pctx);

    return ret == 0;
}
Esempio n. 12
0
static int test_secret(SSL *s, unsigned char *prk,
                       const unsigned char *label, size_t labellen,
                       const unsigned char *ref_secret,
                       const unsigned char *ref_key, const unsigned char *ref_iv)
{
    size_t hashsize;
    unsigned char gensecret[EVP_MAX_MD_SIZE];
    unsigned char hash[EVP_MAX_MD_SIZE];
    unsigned char key[KEYLEN];
    unsigned char iv[IVLEN];
    const EVP_MD *md = ssl_handshake_md(s);

    if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashsize)) {
        fprintf(stderr, "Failed to get hash\n");
        return 0;
    }

    if (!tls13_hkdf_expand(s, md, prk, label, labellen, hash, gensecret,
                           hashsize)) {
        fprintf(stderr, "Secret generation failed\n");
        return 0;
    }

    if (memcmp(gensecret, ref_secret, hashsize) != 0) {
        fprintf(stderr, "Generated secret does not match\n");
        return 0;
    }

    if (!tls13_derive_key(s, gensecret, key, KEYLEN)) {
        fprintf(stderr, "Key generation failed\n");
        return 0;
    }

    if (memcmp(key, ref_key, KEYLEN) != 0) {
        fprintf(stderr, "Generated key does not match\n");
        return 0;
    }

    if (!tls13_derive_iv(s, gensecret, iv, IVLEN)) {
        fprintf(stderr, "IV generation failed\n");
        return 0;
    }

    if (memcmp(iv, ref_iv, IVLEN) != 0) {
        fprintf(stderr, "Generated IV does not match\n");
        return 0;
    }

    return 1;
}
Esempio n. 13
0
static int test_secret(SSL *s, unsigned char *prk,
                       const unsigned char *label, size_t labellen,
                       const unsigned char *ref_secret,
                       const unsigned char *ref_key, const unsigned char *ref_iv)
{
    size_t hashsize;
    unsigned char gensecret[EVP_MAX_MD_SIZE];
    unsigned char hash[EVP_MAX_MD_SIZE];
    unsigned char key[KEYLEN];
    unsigned char iv[IVLEN];
    const EVP_MD *md = ssl_handshake_md(s);

    if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashsize)) {
        TEST_error("Failed to get hash");
        return 0;
    }

    if (!tls13_hkdf_expand(s, md, prk, label, labellen, hash, hashsize,
                           gensecret, hashsize)) {
        TEST_error("Secret generation failed");
        return 0;
    }

    if (!TEST_mem_eq(gensecret, hashsize, ref_secret, hashsize))
        return 0;

    if (!tls13_derive_key(s, md, gensecret, key, KEYLEN)) {
        TEST_error("Key generation failed");
        return 0;
    }

    if (!TEST_mem_eq(key, KEYLEN, ref_key, KEYLEN))
        return 0;

    if (!tls13_derive_iv(s, md, gensecret, iv, IVLEN)) {
        TEST_error("IV generation failed");
        return 0;
    }

    if (!TEST_mem_eq(iv, IVLEN, ref_iv, IVLEN))
        return 0;

    return 1;
}
Esempio n. 14
0
/*
 * Given the previous secret |prevsecret| and a new input secret |insecret| of
 * length |insecretlen|, generate a new secret and store it in the location
 * pointed to by |outsecret|. Returns 1 on success  0 on failure.
 */
static int tls13_generate_secret(SSL *s, const unsigned char *prevsecret,
                                 const unsigned char *insecret,
                                 size_t insecretlen,
                                 unsigned char *outsecret)
{
    const EVP_MD *md = ssl_handshake_md(s);
    size_t mdlen, prevsecretlen;
    int ret;
    EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);

    if (pctx == NULL)
        return 0;

    mdlen = EVP_MD_size(md);

    if (insecret == NULL) {
        insecret = default_zeros;
        insecretlen = mdlen;
    }
    if (prevsecret == NULL) {
        prevsecret = default_zeros;
        prevsecretlen = 0;
    } else {
        prevsecretlen = mdlen;
    }

    ret = EVP_PKEY_derive_init(pctx) <= 0
            || EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY)
               <= 0
            || EVP_PKEY_CTX_set_hkdf_md(pctx, md) <= 0
            || EVP_PKEY_CTX_set1_hkdf_key(pctx, insecret, insecretlen) <= 0
            || EVP_PKEY_CTX_set1_hkdf_salt(pctx, prevsecret, prevsecretlen)
               <= 0
            || EVP_PKEY_derive(pctx, outsecret, &mdlen)
               <= 0;

    EVP_PKEY_CTX_free(pctx);
    return ret == 0;
}
Esempio n. 15
0
int tls13_export_keying_material(SSL *s, unsigned char *out, size_t olen,
                                 const char *label, size_t llen,
                                 const unsigned char *context,
                                 size_t contextlen, int use_context)
{
    unsigned char exportsecret[EVP_MAX_MD_SIZE];
    static const unsigned char exporterlabel[] = "exporter";
    unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
    const EVP_MD *md = ssl_handshake_md(s);
    EVP_MD_CTX *ctx = EVP_MD_CTX_new();
    unsigned int hashsize, datalen;
    int ret = 0;

    if (ctx == NULL || !ossl_statem_export_allowed(s))
        goto err;

    if (!use_context)
        contextlen = 0;

    if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
            || EVP_DigestUpdate(ctx, context, contextlen) <= 0
            || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
            || EVP_DigestInit_ex(ctx, md, NULL) <= 0
            || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
            || !tls13_hkdf_expand(s, md, s->exporter_master_secret,
                                  (const unsigned char *)label, llen,
                                  data, datalen, exportsecret, hashsize, 0)
            || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
                                  sizeof(exporterlabel) - 1, hash, hashsize,
                                  out, olen, 0))
        goto err;

    ret = 1;
 err:
    EVP_MD_CTX_free(ctx);
    return ret;
}
Esempio n. 16
0
int tls13_change_cipher_state(SSL *s, int which)
{
    static const unsigned char client_early_traffic[] = "c e traffic";
    static const unsigned char client_handshake_traffic[] = "c hs traffic";
    static const unsigned char client_application_traffic[] = "c ap traffic";
    static const unsigned char server_handshake_traffic[] = "s hs traffic";
    static const unsigned char server_application_traffic[] = "s ap traffic";
    static const unsigned char exporter_master_secret[] = "exp master";
    static const unsigned char resumption_master_secret[] = "res master";
    static const unsigned char early_exporter_master_secret[] = "e exp master";
    unsigned char *iv;
    unsigned char secret[EVP_MAX_MD_SIZE];
    unsigned char hashval[EVP_MAX_MD_SIZE];
    unsigned char *hash = hashval;
    unsigned char *insecret;
    unsigned char *finsecret = NULL;
    const char *log_label = NULL;
    EVP_CIPHER_CTX *ciph_ctx;
    size_t finsecretlen = 0;
    const unsigned char *label;
    size_t labellen, hashlen = 0;
    int ret = 0;
    const EVP_MD *md = NULL;
    const EVP_CIPHER *cipher = NULL;

    if (which & SSL3_CC_READ) {
        if (s->enc_read_ctx != NULL) {
            EVP_CIPHER_CTX_reset(s->enc_read_ctx);
        } else {
            s->enc_read_ctx = EVP_CIPHER_CTX_new();
            if (s->enc_read_ctx == NULL) {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                         SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
                goto err;
            }
        }
        ciph_ctx = s->enc_read_ctx;
        iv = s->read_iv;

        RECORD_LAYER_reset_read_sequence(&s->rlayer);
    } else {
        s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
        if (s->enc_write_ctx != NULL) {
            EVP_CIPHER_CTX_reset(s->enc_write_ctx);
        } else {
            s->enc_write_ctx = EVP_CIPHER_CTX_new();
            if (s->enc_write_ctx == NULL) {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                         SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
                goto err;
            }
        }
        ciph_ctx = s->enc_write_ctx;
        iv = s->write_iv;

        RECORD_LAYER_reset_write_sequence(&s->rlayer);
    }

    if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
            || ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
        if (which & SSL3_CC_EARLY) {
            EVP_MD_CTX *mdctx = NULL;
            long handlen;
            void *hdata;
            unsigned int hashlenui;
            const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);

            insecret = s->early_secret;
            label = client_early_traffic;
            labellen = sizeof(client_early_traffic) - 1;
            log_label = CLIENT_EARLY_LABEL;

            handlen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
            if (handlen <= 0) {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                         SSL_F_TLS13_CHANGE_CIPHER_STATE,
                         SSL_R_BAD_HANDSHAKE_LENGTH);
                goto err;
            }

            if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
                    && s->max_early_data > 0
                    && s->session->ext.max_early_data == 0) {
                /*
                 * If we are attempting to send early data, and we've decided to
                 * actually do it but max_early_data in s->session is 0 then we
                 * must be using an external PSK.
                 */
                if (!ossl_assert(s->psksession != NULL
                        && s->max_early_data ==
                           s->psksession->ext.max_early_data)) {
                    SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                             SSL_F_TLS13_CHANGE_CIPHER_STATE,
                             ERR_R_INTERNAL_ERROR);
                    goto err;
                }
                sslcipher = SSL_SESSION_get0_cipher(s->psksession);
            }
            if (sslcipher == NULL) {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                         SSL_F_TLS13_CHANGE_CIPHER_STATE, SSL_R_BAD_PSK);
                goto err;
            }

            /*
             * We need to calculate the handshake digest using the digest from
             * the session. We haven't yet selected our ciphersuite so we can't
             * use ssl_handshake_md().
             */
            mdctx = EVP_MD_CTX_new();
            if (mdctx == NULL) {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                         SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
                goto err;
            }
            cipher = EVP_get_cipherbynid(SSL_CIPHER_get_cipher_nid(sslcipher));
            md = ssl_md(sslcipher->algorithm2);
            if (md == NULL || !EVP_DigestInit_ex(mdctx, md, NULL)
                    || !EVP_DigestUpdate(mdctx, hdata, handlen)
                    || !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                         SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
                EVP_MD_CTX_free(mdctx);
                goto err;
            }
            hashlen = hashlenui;
            EVP_MD_CTX_free(mdctx);

            if (!tls13_hkdf_expand(s, md, insecret,
                                   early_exporter_master_secret,
                                   sizeof(early_exporter_master_secret) - 1,
                                   hashval, hashlen,
                                   s->early_exporter_master_secret, hashlen,
                                   1)) {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                         SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
                goto err;
            }

            if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL,
                                s->early_exporter_master_secret, hashlen)) {
                /* SSLfatal() already called */
                goto err;
            }
        } else if (which & SSL3_CC_HANDSHAKE) {
            insecret = s->handshake_secret;
            finsecret = s->client_finished_secret;
            finsecretlen = EVP_MD_size(ssl_handshake_md(s));
            label = client_handshake_traffic;
            labellen = sizeof(client_handshake_traffic) - 1;
            log_label = CLIENT_HANDSHAKE_LABEL;
            /*
             * The handshake hash used for the server read/client write handshake
             * traffic secret is the same as the hash for the server
             * write/client read handshake traffic secret. However, if we
             * processed early data then we delay changing the server
             * read/client write cipher state until later, and the handshake
             * hashes have moved on. Therefore we use the value saved earlier
             * when we did the server write/client read change cipher state.
             */
            hash = s->handshake_traffic_hash;
        } else {
            insecret = s->master_secret;
            label = client_application_traffic;
            labellen = sizeof(client_application_traffic) - 1;
            log_label = CLIENT_APPLICATION_LABEL;
            /*
             * For this we only use the handshake hashes up until the server
             * Finished hash. We do not include the client's Finished, which is
             * what ssl_handshake_hash() would give us. Instead we use the
             * previously saved value.
             */
            hash = s->server_finished_hash;
        }
    } else {
        /* Early data never applies to client-read/server-write */
        if (which & SSL3_CC_HANDSHAKE) {
            insecret = s->handshake_secret;
            finsecret = s->server_finished_secret;
            finsecretlen = EVP_MD_size(ssl_handshake_md(s));
            label = server_handshake_traffic;
            labellen = sizeof(server_handshake_traffic) - 1;
            log_label = SERVER_HANDSHAKE_LABEL;
        } else {
            insecret = s->master_secret;
            label = server_application_traffic;
            labellen = sizeof(server_application_traffic) - 1;
            log_label = SERVER_APPLICATION_LABEL;
        }
    }

    if (!(which & SSL3_CC_EARLY)) {
        md = ssl_handshake_md(s);
        cipher = s->s3->tmp.new_sym_enc;
        if (!ssl3_digest_cached_records(s, 1)
                || !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
            /* SSLfatal() already called */;
            goto err;
        }
    }

    /*
     * Save the hash of handshakes up to now for use when we calculate the
     * client application traffic secret
     */
    if (label == server_application_traffic)
        memcpy(s->server_finished_hash, hashval, hashlen);

    if (label == server_handshake_traffic)
        memcpy(s->handshake_traffic_hash, hashval, hashlen);

    if (label == client_application_traffic) {
        /*
         * We also create the resumption master secret, but this time use the
         * hash for the whole handshake including the Client Finished
         */
        if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
                               resumption_master_secret,
                               sizeof(resumption_master_secret) - 1,
                               hashval, hashlen, s->resumption_master_secret,
                               hashlen, 1)) {
            /* SSLfatal() already called */
            goto err;
        }
    }

    if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher,
                                  insecret, hash, label, labellen, secret, iv,
                                  ciph_ctx)) {
        /* SSLfatal() already called */
        goto err;
    }

    if (label == server_application_traffic) {
        memcpy(s->server_app_traffic_secret, secret, hashlen);
        /* Now we create the exporter master secret */
        if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
                               exporter_master_secret,
                               sizeof(exporter_master_secret) - 1,
                               hash, hashlen, s->exporter_master_secret,
                               hashlen, 1)) {
            /* SSLfatal() already called */
            goto err;
        }

        if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret,
                            hashlen)) {
            /* SSLfatal() already called */
            goto err;
        }
    } else if (label == client_application_traffic)
        memcpy(s->client_app_traffic_secret, secret, hashlen);

    if (!ssl_log_secret(s, log_label, secret, hashlen)) {
        /* SSLfatal() already called */
        goto err;
    }

    if (finsecret != NULL
            && !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
                                         finsecret, finsecretlen)) {
        /* SSLfatal() already called */
        goto err;
    }

    if (!s->server && label == client_early_traffic)
        s->statem.enc_write_state = ENC_WRITE_STATE_WRITE_PLAIN_ALERTS;
    else
        s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
    ret = 1;
 err:
    OPENSSL_cleanse(secret, sizeof(secret));
    return ret;
}
Esempio n. 17
0
int tls13_change_cipher_state(SSL *s, int which)
{
    static const unsigned char client_handshake_traffic[] =
        "client handshake traffic secret";
    static const unsigned char client_application_traffic[] =
        "client application traffic secret";
    static const unsigned char server_handshake_traffic[] =
        "server handshake traffic secret";
    static const unsigned char server_application_traffic[] =
        "server application traffic secret";
    static const unsigned char resumption_master_secret[] =
        "resumption master secret";
    unsigned char key[EVP_MAX_KEY_LENGTH];
    unsigned char *iv;
    unsigned char secret[EVP_MAX_MD_SIZE];
    unsigned char hashval[EVP_MAX_MD_SIZE];
    unsigned char *hash = hashval;
    unsigned char *insecret;
    unsigned char *finsecret = NULL;
    const char *log_label = NULL;
    EVP_CIPHER_CTX *ciph_ctx;
    const EVP_CIPHER *ciph = s->s3->tmp.new_sym_enc;
    size_t ivlen, keylen, finsecretlen = 0;
    const unsigned char *label;
    size_t labellen, hashlen = 0;
    int ret = 0;

    if (which & SSL3_CC_READ) {
        if (s->enc_read_ctx != NULL) {
            EVP_CIPHER_CTX_reset(s->enc_read_ctx);
        } else {
            s->enc_read_ctx = EVP_CIPHER_CTX_new();
            if (s->enc_read_ctx == NULL) {
                SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
                goto err;
            }
        }
        ciph_ctx = s->enc_read_ctx;
        iv = s->read_iv;

        RECORD_LAYER_reset_read_sequence(&s->rlayer);
    } else {
        if (s->enc_write_ctx != NULL) {
            EVP_CIPHER_CTX_reset(s->enc_write_ctx);
        } else {
            s->enc_write_ctx = EVP_CIPHER_CTX_new();
            if (s->enc_write_ctx == NULL) {
                SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
                goto err;
            }
        }
        ciph_ctx = s->enc_write_ctx;
        iv = s->write_iv;

        RECORD_LAYER_reset_write_sequence(&s->rlayer);
    }

    if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
            || ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
        if (which & SSL3_CC_HANDSHAKE) {
            insecret = s->handshake_secret;
            finsecret = s->client_finished_secret;
            finsecretlen = EVP_MD_size(ssl_handshake_md(s));
            label = client_handshake_traffic;
            labellen = sizeof(client_handshake_traffic) - 1;
            log_label = CLIENT_HANDSHAKE_LABEL;
        } else {
            insecret = s->master_secret;
            label = client_application_traffic;
            labellen = sizeof(client_application_traffic) - 1;
            log_label = CLIENT_APPLICATION_LABEL;
            /*
             * For this we only use the handshake hashes up until the server
             * Finished hash. We do not include the client's Finished, which is
             * what ssl_handshake_hash() would give us. Instead we use the
             * previously saved value.
             */
            hash = s->server_finished_hash;
        }
    } else {
        if (which & SSL3_CC_HANDSHAKE) {
            insecret = s->handshake_secret;
            finsecret = s->server_finished_secret;
            finsecretlen = EVP_MD_size(ssl_handshake_md(s));
            label = server_handshake_traffic;
            labellen = sizeof(server_handshake_traffic) - 1;
            log_label = SERVER_HANDSHAKE_LABEL;
        } else {
            insecret = s->master_secret;
            label = server_application_traffic;
            labellen = sizeof(server_application_traffic) - 1;
            log_label = SERVER_APPLICATION_LABEL;
        }
    }

    if (!ssl3_digest_cached_records(s, 1)
            || !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
        SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    /*
     * Save the hash of handshakes up to now for use when we calculate the
     * client application traffic secret
     */
    if (label == server_application_traffic)
        memcpy(s->server_finished_hash, hashval, hashlen);

    if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret, label, labellen,
                           hash, secret, hashlen)) {
        SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (label == client_application_traffic) {
        /*
         * We also create the resumption master secret, but this time use the
         * hash for the whole handshake including the Client Finished
         */
        if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
                               resumption_master_secret,
                               sizeof(resumption_master_secret) - 1,
                               hashval, s->session->master_key, hashlen)) {
            SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
            goto err;
        }
        s->session->master_key_length = hashlen;
    }

    /* TODO(size_t): convert me */
    keylen = EVP_CIPHER_key_length(ciph);
    ivlen = EVP_CIPHER_iv_length(ciph);

    if (!ssl_log_secret(s, log_label, secret, hashlen)) {
        SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (!tls13_derive_key(s, secret, key, keylen)
            || !tls13_derive_iv(s, secret, iv, ivlen)
            || (finsecret != NULL && !tls13_derive_finishedkey(s,
                                                           ssl_handshake_md(s),
                                                           secret,
                                                           finsecret,
                                                           finsecretlen))) {
        SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, key, NULL,
                          (which & SSL3_CC_WRITE)) <= 0) {
        SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_EVP_LIB);
        goto err;
    }

#ifdef OPENSSL_SSL_TRACE_CRYPTO
    if (s->msg_callback) {
        int wh = which & SSL3_CC_WRITE ? TLS1_RT_CRYPTO_WRITE : 0;

        if (ciph->key_len)
            s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
                            key, ciph->key_len, s, s->msg_callback_arg);

        wh |= TLS1_RT_CRYPTO_IV;
        s->msg_callback(2, s->version, wh, iv, ivlen, s,
                        s->msg_callback_arg);
    }
#endif

    ret = 1;
 err:
    OPENSSL_cleanse(secret, sizeof(secret));
    OPENSSL_cleanse(key, sizeof(key));
    return ret;
}
Esempio n. 18
0
static int test_handshake_secrets(void)
{
    SSL_CTX *ctx = NULL;
    SSL *s = NULL;
    int ret = 0;
    size_t hashsize;
    unsigned char out_master_secret[EVP_MAX_MD_SIZE];
    size_t master_secret_length;

    ctx = SSL_CTX_new(TLS_method());
    if (!TEST_ptr(ctx))
        goto err;

    s = SSL_new(ctx);
    if (!TEST_ptr(s ))
        goto err;

    s->session = SSL_SESSION_new();
    if (!TEST_ptr(s->session))
        goto err;

    if (!TEST_true(tls13_generate_secret(s, ssl_handshake_md(s), NULL, NULL, 0,
                                         (unsigned char *)&s->early_secret))) {
        TEST_info("Early secret generation failed");
        goto err;
    }

    if (!TEST_mem_eq(s->early_secret, sizeof(early_secret),
                     early_secret, sizeof(early_secret))) {
        TEST_info("Early secret does not match");
        goto err;
    }

    if (!TEST_true(tls13_generate_handshake_secret(s, ecdhe_secret,
                                                   sizeof(ecdhe_secret)))) {
        TEST_info("Hanshake secret generation failed");
        goto err;
    }

    if (!TEST_mem_eq(s->handshake_secret, sizeof(handshake_secret),
                     handshake_secret, sizeof(handshake_secret)))
        goto err;

    hashsize = EVP_MD_size(ssl_handshake_md(s));
    if (!TEST_size_t_eq(sizeof(client_hts), hashsize))
        goto err;
    if (!TEST_size_t_eq(sizeof(client_hts_key), KEYLEN))
        goto err;
    if (!TEST_size_t_eq(sizeof(client_hts_iv), IVLEN))
        goto err;

    if (!TEST_true(test_secret(s, s->handshake_secret,
                               (unsigned char *)client_hts_label,
                               strlen(client_hts_label), client_hts,
                               client_hts_key, client_hts_iv))) {
        TEST_info("Client handshake secret test failed");
        goto err;
    }

    if (!TEST_size_t_eq(sizeof(server_hts), hashsize))
        goto err;
    if (!TEST_size_t_eq(sizeof(server_hts_key), KEYLEN))
        goto err;
    if (!TEST_size_t_eq(sizeof(server_hts_iv), IVLEN))
        goto err;

    if (!TEST_true(test_secret(s, s->handshake_secret,
                               (unsigned char *)server_hts_label,
                               strlen(server_hts_label), server_hts,
                               server_hts_key, server_hts_iv))) {
        TEST_info("Server handshake secret test failed");
        goto err;
    }

    /*
     * Ensure the mocked out ssl_handshake_hash() returns the full handshake
     * hash.
     */
    full_hash = 1;

    if (!TEST_true(tls13_generate_master_secret(s, out_master_secret,
                                                s->handshake_secret, hashsize,
                                                &master_secret_length))) {
        TEST_info("Master secret generation failed");
        goto err;
    }

    if (!TEST_mem_eq(out_master_secret, master_secret_length,
                     master_secret, sizeof(master_secret))) {
        TEST_info("Master secret does not match");
        goto err;
    }

    if (!TEST_size_t_eq(sizeof(client_ats), hashsize))
        goto err;
    if (!TEST_size_t_eq(sizeof(client_ats_key), KEYLEN))
        goto err;
    if (!TEST_size_t_eq(sizeof(client_ats_iv), IVLEN))
        goto err;

    if (!TEST_true(test_secret(s, out_master_secret,
                               (unsigned char *)client_ats_label,
                               strlen(client_ats_label), client_ats,
                               client_ats_key, client_ats_iv))) {
        TEST_info("Client application data secret test failed");
        goto err;
    }

    if (!TEST_size_t_eq(sizeof(server_ats), hashsize))
        goto err;
    if (!TEST_size_t_eq(sizeof(server_ats_key), KEYLEN))
        goto err;
    if (!TEST_size_t_eq(sizeof(server_ats_iv), IVLEN))
        goto err;

    if (!TEST_true(test_secret(s, out_master_secret,
                               (unsigned char *)server_ats_label,
                               strlen(server_ats_label), server_ats,
                               server_ats_key, server_ats_iv))) {
        TEST_info("Server application data secret test failed");
        goto err;
    }

    ret = 1;
 err:
    SSL_free(s);
    SSL_CTX_free(ctx);
    return ret;
}
Esempio n. 19
0
static int test_handshake_secrets(void)
{
    SSL_CTX *ctx = NULL;
    SSL *s = NULL;
    int ret = 0;
    size_t hashsize;
    unsigned char out_master_secret[EVP_MAX_MD_SIZE];
    size_t master_secret_length;

    ctx = SSL_CTX_new(TLS_method());
    if (ctx == NULL)
        goto err;

    s = SSL_new(ctx);
    if (s == NULL)
        goto err;

    s->session = SSL_SESSION_new();
    if (s->session == NULL)
        goto err;

    if (!tls13_generate_secret(s, ssl_handshake_md(s), NULL, NULL, 0,
                               (unsigned char *)&s->early_secret)) {
        fprintf(stderr, "Early secret generation failed\n");
        goto err;
    }

    if (memcmp(s->early_secret, early_secret, sizeof(early_secret)) != 0) {
        fprintf(stderr, "Early secret does not match\n");
        goto err;
    }

    if (!tls13_generate_handshake_secret(s, ecdhe_secret,
                                         sizeof(ecdhe_secret))) {
        fprintf(stderr, "Hanshake secret generation failed\n");
        goto err;
    }

    if (memcmp(s->handshake_secret, handshake_secret,
               sizeof(handshake_secret)) != 0) {
        fprintf(stderr, "Handshake secret does not match\n");
        goto err;
    }

    hashsize = EVP_MD_size(ssl_handshake_md(s));
    if (sizeof(client_hts) != hashsize || sizeof(client_hts_key) != KEYLEN
            || sizeof(client_hts_iv) != IVLEN) {
        fprintf(stderr, "Internal test error\n");
        goto err;
    }

    if (!test_secret(s, s->handshake_secret, (unsigned char *)client_hts_label,
                     strlen(client_hts_label), client_hts, client_hts_key,
                     client_hts_iv)) {
        fprintf(stderr, "Client handshake secret test failed\n");
        goto err;
    }

    if (sizeof(server_hts) != hashsize || sizeof(server_hts_key) != KEYLEN
            || sizeof(server_hts_iv) != IVLEN) {
        fprintf(stderr, "Internal test error\n");
        goto err;
    }

    if (!test_secret(s, s->handshake_secret, (unsigned char *)server_hts_label,
                     strlen(server_hts_label), server_hts, server_hts_key,
                     server_hts_iv)) {
        fprintf(stderr, "Server handshake secret test failed\n");
        goto err;
    }

    /*
     * Ensure the mocked out ssl_handshake_hash() returns the full handshake
     * hash.
     */
    full_hash = 1;

    if (!tls13_generate_master_secret(s, out_master_secret,
                                      s->handshake_secret, hashsize,
                                      &master_secret_length)) {
        fprintf(stderr, "Master secret generation failed\n");
        goto err;
    }

    if (master_secret_length != sizeof(master_secret) ||
            memcmp(out_master_secret, master_secret,
                   sizeof(master_secret)) != 0) {
        fprintf(stderr, "Master secret does not match\n");
        goto err;
    }

    if (sizeof(client_ats) != hashsize || sizeof(client_ats_key) != KEYLEN
            || sizeof(client_ats_iv) != IVLEN) {
        fprintf(stderr, "Internal test error\n");
        goto err;
    }

    if (!test_secret(s, out_master_secret, (unsigned char *)client_ats_label,
                     strlen(client_ats_label), client_ats, client_ats_key,
                     client_ats_iv)) {
        fprintf(stderr, "Client application data secret test failed\n");
        goto err;
    }

    if (sizeof(server_ats) != hashsize || sizeof(server_ats_key) != KEYLEN
            || sizeof(server_ats_iv) != IVLEN) {
        fprintf(stderr, "Internal test error\n");
        goto err;
    }

    if (!test_secret(s, out_master_secret, (unsigned char *)server_ats_label,
                     strlen(server_ats_label), server_ats, server_ats_key,
                     server_ats_iv)) {
        fprintf(stderr, "Server application data secret test failed\n");
        goto err;
    }

    ret = 1;
 err:
    SSL_free(s);
    SSL_CTX_free(ctx);
    return ret;
}