diff options
Diffstat (limited to 'crypto/openssl/ssl/bad_dtls_test.c')
| -rw-r--r-- | crypto/openssl/ssl/bad_dtls_test.c | 923 |
1 files changed, 923 insertions, 0 deletions
diff --git a/crypto/openssl/ssl/bad_dtls_test.c b/crypto/openssl/ssl/bad_dtls_test.c new file mode 100644 index 0000000..d42817fc --- /dev/null +++ b/crypto/openssl/ssl/bad_dtls_test.c @@ -0,0 +1,923 @@ +/* + * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +/* + * Unit test for Cisco DTLS1_BAD_VER session resume, as used by + * AnyConnect VPN protocol. + * + * This is designed to exercise the code paths in + * http://git.infradead.org/users/dwmw2/openconnect.git/blob/HEAD:/dtls.c + * which have frequently been affected by regressions in DTLS1_BAD_VER + * support. + * + * Note that unlike other SSL tests, we don't test against our own SSL + * server method. Firstly because we don't have one; we *only* support + * DTLS1_BAD_VER as a client. And secondly because even if that were + * fixed up it's the wrong thing to test against — because if changes + * are made in generic DTLS code which don't take DTLS1_BAD_VER into + * account, there's plenty of scope for making those changes such that + * they break *both* the client and the server in the same way. + * + * So we handle the server side manually. In a session resume there isn't + * much to be done anyway. + */ +#include <string.h> + +/* On Windows this will include <winsock2.h> and thus it needs to be + * included *before* anything that includes <windows.h>. Ick. */ +#include "e_os.h" /* for 'inline' */ + +#include <openssl/bio.h> +#include <openssl/crypto.h> +#include <openssl/evp.h> +#include <openssl/ssl.h> +#include <openssl/err.h> +#include <openssl/rand.h> + +/* PACKET functions lifted from OpenSSL 1.1's ssl/packet_locl.h */ +typedef struct { + /* Pointer to where we are currently reading from */ + const unsigned char *curr; + /* Number of bytes remaining */ + size_t remaining; +} PACKET; + +/* Internal unchecked shorthand; don't use outside this file. */ +static inline void packet_forward(PACKET *pkt, size_t len) +{ + pkt->curr += len; + pkt->remaining -= len; +} + +/* + * Returns the number of bytes remaining to be read in the PACKET + */ +static inline size_t PACKET_remaining(const PACKET *pkt) +{ + return pkt->remaining; +} + +/* + * Initialise a PACKET with |len| bytes held in |buf|. This does not make a + * copy of the data so |buf| must be present for the whole time that the PACKET + * is being used. + */ +static inline int PACKET_buf_init(PACKET *pkt, + const unsigned char *buf, + size_t len) +{ + /* Sanity check for negative values. */ + if (len > (size_t)65536) + return 0; + + pkt->curr = buf; + pkt->remaining = len; + return 1; +} + +/* + * Returns 1 if the packet has length |num| and its contents equal the |num| + * bytes read from |ptr|. Returns 0 otherwise (lengths or contents not equal). + * If lengths are equal, performs the comparison in constant time. + */ +static inline int PACKET_equal(const PACKET *pkt, const void *ptr, + size_t num) +{ + if (PACKET_remaining(pkt) != num) + return 0; + return CRYPTO_memcmp(pkt->curr, ptr, num) == 0; +} + +/* + * Peek ahead at 2 bytes in network order from |pkt| and store the value in + * |*data| + */ +static inline int PACKET_peek_net_2(const PACKET *pkt, + unsigned int *data) +{ + if (PACKET_remaining(pkt) < 2) + return 0; + + *data = ((unsigned int)(*pkt->curr)) << 8; + *data |= *(pkt->curr + 1); + + return 1; +} + +/* Equivalent of n2s */ +/* Get 2 bytes in network order from |pkt| and store the value in |*data| */ +static inline int PACKET_get_net_2(PACKET *pkt, + unsigned int *data) +{ + if (!PACKET_peek_net_2(pkt, data)) + return 0; + + packet_forward(pkt, 2); + + return 1; +} + +/* Peek ahead at 1 byte from |pkt| and store the value in |*data| */ +static inline int PACKET_peek_1(const PACKET *pkt, + unsigned int *data) +{ + if (!PACKET_remaining(pkt)) + return 0; + + *data = *pkt->curr; + + return 1; +} + +/* Get 1 byte from |pkt| and store the value in |*data| */ +static inline int PACKET_get_1(PACKET *pkt, unsigned int *data) +{ + if (!PACKET_peek_1(pkt, data)) + return 0; + + packet_forward(pkt, 1); + + return 1; +} + +/* + * Peek ahead at |len| bytes from the |pkt| and store a pointer to them in + * |*data|. This just points at the underlying buffer that |pkt| is using. The + * caller should not free this data directly (it will be freed when the + * underlying buffer gets freed + */ +static inline int PACKET_peek_bytes(const PACKET *pkt, + const unsigned char **data, + size_t len) +{ + if (PACKET_remaining(pkt) < len) + return 0; + + *data = pkt->curr; + + return 1; +} + +/* + * Read |len| bytes from the |pkt| and store a pointer to them in |*data|. This + * just points at the underlying buffer that |pkt| is using. The caller should + * not free this data directly (it will be freed when the underlying buffer gets + * freed + */ +static inline int PACKET_get_bytes(PACKET *pkt, + const unsigned char **data, + size_t len) +{ + if (!PACKET_peek_bytes(pkt, data, len)) + return 0; + + packet_forward(pkt, len); + + return 1; +} + +/* Peek ahead at |len| bytes from |pkt| and copy them to |data| */ +static inline int PACKET_peek_copy_bytes(const PACKET *pkt, + unsigned char *data, + size_t len) +{ + if (PACKET_remaining(pkt) < len) + return 0; + + memcpy(data, pkt->curr, len); + + return 1; +} + +/* + * Read |len| bytes from |pkt| and copy them to |data|. + * The caller is responsible for ensuring that |data| can hold |len| bytes. + */ +static inline int PACKET_copy_bytes(PACKET *pkt, + unsigned char *data, + size_t len) +{ + if (!PACKET_peek_copy_bytes(pkt, data, len)) + return 0; + + packet_forward(pkt, len); + + return 1; +} + + +/* Move the current reading position forward |len| bytes */ +static inline int PACKET_forward(PACKET *pkt, size_t len) +{ + if (PACKET_remaining(pkt) < len) + return 0; + + packet_forward(pkt, len); + + return 1; +} + +/* + * Reads a variable-length vector prefixed with a one-byte length, and stores + * the contents in |subpkt|. |pkt| can equal |subpkt|. + * Data is not copied: the |subpkt| packet will share its underlying buffer with + * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. + * Upon failure, the original |pkt| and |subpkt| are not modified. + */ +static inline int PACKET_get_length_prefixed_1(PACKET *pkt, + PACKET *subpkt) +{ + unsigned int length; + const unsigned char *data; + PACKET tmp = *pkt; + if (!PACKET_get_1(&tmp, &length) || + !PACKET_get_bytes(&tmp, &data, (size_t)length)) { + return 0; + } + + *pkt = tmp; + subpkt->curr = data; + subpkt->remaining = length; + + return 1; +} + +#define OSSL_NELEM(x) (sizeof(x)/sizeof(x[0])) + +/* For DTLS1_BAD_VER packets the MAC doesn't include the handshake header */ +#define MAC_OFFSET (DTLS1_RT_HEADER_LENGTH + DTLS1_HM_HEADER_LENGTH) + +static unsigned char client_random[SSL3_RANDOM_SIZE]; +static unsigned char server_random[SSL3_RANDOM_SIZE]; + +/* These are all generated locally, sized purely according to our own whim */ +static unsigned char session_id[32]; +static unsigned char master_secret[48]; +static unsigned char cookie[20]; + +/* We've hard-coded the cipher suite; we know it's 104 bytes */ +static unsigned char key_block[104]; +#define mac_key (key_block + 20) +#define dec_key (key_block + 40) +#define enc_key (key_block + 56) + +static EVP_MD_CTX handshake_md5; +static EVP_MD_CTX handshake_sha1; + +/* PRF lifted from ssl/t1_enc.c since we can't easily use it directly */ +static int tls1_P_hash(const EVP_MD *md, const unsigned char *sec, + int sec_len, + const void *seed1, int seed1_len, + const void *seed2, int seed2_len, + const void *seed3, int seed3_len, + unsigned char *out, int olen) +{ + int chunk; + size_t j; + EVP_MD_CTX ctx, ctx_tmp, ctx_init; + EVP_PKEY *prf_mac_key; + unsigned char A1[EVP_MAX_MD_SIZE]; + size_t A1_len; + int ret = 0; + + chunk = EVP_MD_size(md); + OPENSSL_assert(chunk >= 0); + + EVP_MD_CTX_init(&ctx); + EVP_MD_CTX_init(&ctx_tmp); + EVP_MD_CTX_init(&ctx_init); + EVP_MD_CTX_set_flags(&ctx_init, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); + prf_mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, sec, sec_len); + if (!prf_mac_key) + goto err; + if (!EVP_DigestSignInit(&ctx_init, NULL, md, NULL, prf_mac_key)) + goto err; + if (!EVP_MD_CTX_copy_ex(&ctx, &ctx_init)) + goto err; + if (seed1 && !EVP_DigestSignUpdate(&ctx, seed1, seed1_len)) + goto err; + if (seed2 && !EVP_DigestSignUpdate(&ctx, seed2, seed2_len)) + goto err; + if (seed3 && !EVP_DigestSignUpdate(&ctx, seed3, seed3_len)) + goto err; + if (!EVP_DigestSignFinal(&ctx, A1, &A1_len)) + goto err; + + for (;;) { + /* Reinit mac contexts */ + if (!EVP_MD_CTX_copy_ex(&ctx, &ctx_init)) + goto err; + if (!EVP_DigestSignUpdate(&ctx, A1, A1_len)) + goto err; + if (olen > chunk && !EVP_MD_CTX_copy_ex(&ctx_tmp, &ctx)) + goto err; + if (seed1 && !EVP_DigestSignUpdate(&ctx, seed1, seed1_len)) + goto err; + if (seed2 && !EVP_DigestSignUpdate(&ctx, seed2, seed2_len)) + goto err; + if (seed3 && !EVP_DigestSignUpdate(&ctx, seed3, seed3_len)) + goto err; + + if (olen > chunk) { + if (!EVP_DigestSignFinal(&ctx, out, &j)) + goto err; + out += j; + olen -= j; + /* calc the next A1 value */ + if (!EVP_DigestSignFinal(&ctx_tmp, A1, &A1_len)) + goto err; + } else { /* last one */ + + if (!EVP_DigestSignFinal(&ctx, A1, &A1_len)) + goto err; + memcpy(out, A1, olen); + break; + } + } + ret = 1; + err: + EVP_PKEY_free(prf_mac_key); + EVP_MD_CTX_cleanup(&ctx); + EVP_MD_CTX_cleanup(&ctx_tmp); + EVP_MD_CTX_cleanup(&ctx_init); + OPENSSL_cleanse(A1, sizeof(A1)); + return ret; +} + +/* seed1 through seed5 are virtually concatenated */ +static int do_PRF(const void *seed1, int seed1_len, + const void *seed2, int seed2_len, + const void *seed3, int seed3_len, + unsigned char *out, int olen) +{ + unsigned char out2[104]; + int i, len; + + if (olen > (int)sizeof(out2)) + return 0; + + len = sizeof(master_secret) / 2; + + if (!tls1_P_hash(EVP_md5(), master_secret, len, + seed1, seed1_len, seed2, seed2_len, seed3, + seed3_len, out, olen)) + return 0; + + if (!tls1_P_hash(EVP_sha1(), master_secret + len, len, + seed1, seed1_len, seed2, seed2_len, seed3, + seed3_len, out2, olen)) + return 0; + + for (i = 0; i < olen; i++) { + out[i] ^= out2[i]; + } + + return 1; +} + +static SSL_SESSION *client_session(void) +{ + static unsigned char session_asn1[] = { + 0x30, 0x5F, /* SEQUENCE, length 0x5F */ + 0x02, 0x01, 0x01, /* INTEGER, SSL_SESSION_ASN1_VERSION */ + 0x02, 0x02, 0x01, 0x00, /* INTEGER, DTLS1_BAD_VER */ + 0x04, 0x02, 0x00, 0x2F, /* OCTET_STRING, AES128-SHA */ + 0x04, 0x20, /* OCTET_STRING, session id */ +#define SS_SESSID_OFS 15 /* Session ID goes here */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x04, 0x30, /* OCTET_STRING, master secret */ +#define SS_SECRET_OFS 49 /* Master secret goes here */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + }; + const unsigned char *p = session_asn1; + + /* Copy the randomly-generated fields into the above ASN1 */ + memcpy(session_asn1 + SS_SESSID_OFS, session_id, sizeof(session_id)); + memcpy(session_asn1 + SS_SECRET_OFS, master_secret, sizeof(master_secret)); + + return d2i_SSL_SESSION(NULL, &p, sizeof(session_asn1)); +} + +/* Returns 1 for initial ClientHello, 2 for ClientHello with cookie */ +static int validate_client_hello(BIO *wbio) +{ + PACKET pkt, pkt2; + long len; + unsigned char *data; + int cookie_found = 0; + unsigned int u; + + len = BIO_get_mem_data(wbio, (char **)&data); + if (!PACKET_buf_init(&pkt, data, len)) + return 0; + + /* Check record header type */ + if (!PACKET_get_1(&pkt, &u) || u != SSL3_RT_HANDSHAKE) + return 0; + /* Version */ + if (!PACKET_get_net_2(&pkt, &u) || u != DTLS1_BAD_VER) + return 0; + /* Skip the rest of the record header */ + if (!PACKET_forward(&pkt, DTLS1_RT_HEADER_LENGTH - 3)) + return 0; + + /* Check it's a ClientHello */ + if (!PACKET_get_1(&pkt, &u) || u != SSL3_MT_CLIENT_HELLO) + return 0; + /* Skip the rest of the handshake message header */ + if (!PACKET_forward(&pkt, DTLS1_HM_HEADER_LENGTH - 1)) + return 0; + + /* Check client version */ + if (!PACKET_get_net_2(&pkt, &u) || u != DTLS1_BAD_VER) + return 0; + + /* Store random */ + if (!PACKET_copy_bytes(&pkt, client_random, SSL3_RANDOM_SIZE)) + return 0; + + /* Check session id length and content */ + if (!PACKET_get_length_prefixed_1(&pkt, &pkt2) || + !PACKET_equal(&pkt2, session_id, sizeof(session_id))) + return 0; + + /* Check cookie */ + if (!PACKET_get_length_prefixed_1(&pkt, &pkt2)) + return 0; + if (PACKET_remaining(&pkt2)) { + if (!PACKET_equal(&pkt2, cookie, sizeof(cookie))) + return 0; + cookie_found = 1; + } + + /* Skip ciphers */ + if (!PACKET_get_net_2(&pkt, &u) || !PACKET_forward(&pkt, u)) + return 0; + + /* Skip compression */ + if (!PACKET_get_1(&pkt, &u) || !PACKET_forward(&pkt, u)) + return 0; + + /* Skip extensions */ + if (!PACKET_get_net_2(&pkt, &u) || !PACKET_forward(&pkt, u)) + return 0; + + /* Now we are at the end */ + if (PACKET_remaining(&pkt)) + return 0; + + /* Update handshake MAC for second ClientHello (with cookie) */ + if (cookie_found && (!EVP_DigestUpdate(&handshake_md5, data + MAC_OFFSET, + len - MAC_OFFSET) || + !EVP_DigestUpdate(&handshake_sha1, data + MAC_OFFSET, + len - MAC_OFFSET))) + printf("EVP_DigestUpdate() failed\n"); + + (void)BIO_reset(wbio); + + return 1 + cookie_found; +} + +static int send_hello_verify(BIO *rbio) +{ + static unsigned char hello_verify[] = { + 0x16, /* Handshake */ + 0x01, 0x00, /* DTLS1_BAD_VER */ + 0x00, 0x00, /* Epoch 0 */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* Seq# 0 */ + 0x00, 0x23, /* Length */ + 0x03, /* Hello Verify */ + 0x00, 0x00, 0x17, /* Length */ + 0x00, 0x00, /* Seq# 0 */ + 0x00, 0x00, 0x00, /* Fragment offset */ + 0x00, 0x00, 0x17, /* Fragment length */ + 0x01, 0x00, /* DTLS1_BAD_VER */ + 0x14, /* Cookie length */ +#define HV_COOKIE_OFS 28 /* Cookie goes here */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, + }; + + memcpy(hello_verify + HV_COOKIE_OFS, cookie, sizeof(cookie)); + + BIO_write(rbio, hello_verify, sizeof(hello_verify)); + + return 1; +} + +static int send_server_hello(BIO *rbio) +{ + static unsigned char server_hello[] = { + 0x16, /* Handshake */ + 0x01, 0x00, /* DTLS1_BAD_VER */ + 0x00, 0x00, /* Epoch 0 */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, /* Seq# 1 */ + 0x00, 0x52, /* Length */ + 0x02, /* Server Hello */ + 0x00, 0x00, 0x46, /* Length */ + 0x00, 0x01, /* Seq# */ + 0x00, 0x00, 0x00, /* Fragment offset */ + 0x00, 0x00, 0x46, /* Fragment length */ + 0x01, 0x00, /* DTLS1_BAD_VER */ +#define SH_RANDOM_OFS 27 /* Server random goes here */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x20, /* Session ID length */ +#define SH_SESSID_OFS 60 /* Session ID goes here */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x2f, /* Cipher suite AES128-SHA */ + 0x00, /* Compression null */ + }; + static unsigned char change_cipher_spec[] = { + 0x14, /* Change Cipher Spec */ + 0x01, 0x00, /* DTLS1_BAD_VER */ + 0x00, 0x00, /* Epoch 0 */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, /* Seq# 2 */ + 0x00, 0x03, /* Length */ + 0x01, 0x00, 0x02, /* Message */ + }; + + memcpy(server_hello + SH_RANDOM_OFS, server_random, sizeof(server_random)); + memcpy(server_hello + SH_SESSID_OFS, session_id, sizeof(session_id)); + + if (!EVP_DigestUpdate(&handshake_md5, server_hello + MAC_OFFSET, + sizeof(server_hello) - MAC_OFFSET) || + !EVP_DigestUpdate(&handshake_sha1, server_hello + MAC_OFFSET, + sizeof(server_hello) - MAC_OFFSET)) + printf("EVP_DigestUpdate() failed\n"); + + BIO_write(rbio, server_hello, sizeof(server_hello)); + BIO_write(rbio, change_cipher_spec, sizeof(change_cipher_spec)); + + return 1; +} + +/* Create header, HMAC, pad, encrypt and send a record */ +static int send_record(BIO *rbio, unsigned char type, unsigned long seqnr, + const void *msg, size_t len) +{ + /* Note that the order of the record header fields on the wire, + * and in the HMAC, is different. So we just keep them in separate + * variables and handle them individually. */ + static unsigned char epoch[2] = { 0x00, 0x01 }; + static unsigned char seq[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; + static unsigned char ver[2] = { 0x01, 0x00 }; /* DTLS1_BAD_VER */ + unsigned char lenbytes[2]; + HMAC_CTX ctx; + EVP_CIPHER_CTX enc_ctx; + unsigned char iv[16]; + unsigned char pad; + unsigned char *enc; + +#ifdef SIXTY_FOUR_BIT_LONG + seq[0] = (seqnr >> 40) & 0xff; + seq[1] = (seqnr >> 32) & 0xff; +#endif + seq[2] = (seqnr >> 24) & 0xff; + seq[3] = (seqnr >> 16) & 0xff; + seq[4] = (seqnr >> 8) & 0xff; + seq[5] = seqnr & 0xff; + + pad = 15 - ((len + SHA_DIGEST_LENGTH) % 16); + enc = OPENSSL_malloc(len + SHA_DIGEST_LENGTH + 1 + pad); + if (enc == NULL) + return 0; + + /* Copy record to encryption buffer */ + memcpy(enc, msg, len); + + /* Append HMAC to data */ + HMAC_Init(&ctx, mac_key, 20, EVP_sha1()); + HMAC_Update(&ctx, epoch, 2); + HMAC_Update(&ctx, seq, 6); + HMAC_Update(&ctx, &type, 1); + HMAC_Update(&ctx, ver, 2); /* Version */ + lenbytes[0] = len >> 8; + lenbytes[1] = len & 0xff; + HMAC_Update(&ctx, lenbytes, 2); /* Length */ + HMAC_Update(&ctx, enc, len); /* Finally the data itself */ + HMAC_Final(&ctx, enc + len, NULL); + HMAC_CTX_cleanup(&ctx); + + /* Append padding bytes */ + len += SHA_DIGEST_LENGTH; + do { + enc[len++] = pad; + } while (len % 16); + + /* Generate IV, and encrypt */ + RAND_bytes(iv, sizeof(iv)); + EVP_CIPHER_CTX_init(&enc_ctx); + EVP_CipherInit_ex(&enc_ctx, EVP_aes_128_cbc(), NULL, enc_key, iv, 1); + EVP_Cipher(&enc_ctx, enc, enc, len); + EVP_CIPHER_CTX_cleanup(&enc_ctx); + + /* Finally write header (from fragmented variables), IV and encrypted record */ + BIO_write(rbio, &type, 1); + BIO_write(rbio, ver, 2); + BIO_write(rbio, epoch, 2); + BIO_write(rbio, seq, 6); + lenbytes[0] = (len + sizeof(iv)) >> 8; + lenbytes[1] = (len + sizeof(iv)) & 0xff; + BIO_write(rbio, lenbytes, 2); + + BIO_write(rbio, iv, sizeof(iv)); + BIO_write(rbio, enc, len); + + OPENSSL_free(enc); + return 1; +} + +static int send_finished(SSL *s, BIO *rbio) +{ + static unsigned char finished_msg[DTLS1_HM_HEADER_LENGTH + + TLS1_FINISH_MAC_LENGTH] = { + 0x14, /* Finished */ + 0x00, 0x00, 0x0c, /* Length */ + 0x00, 0x03, /* Seq# 3 */ + 0x00, 0x00, 0x00, /* Fragment offset */ + 0x00, 0x00, 0x0c, /* Fragment length */ + /* Finished MAC (12 bytes) */ + }; + unsigned char handshake_hash[EVP_MAX_MD_SIZE * 2]; + + /* Derive key material */ + do_PRF(TLS_MD_KEY_EXPANSION_CONST, TLS_MD_KEY_EXPANSION_CONST_SIZE, + server_random, SSL3_RANDOM_SIZE, + client_random, SSL3_RANDOM_SIZE, + key_block, sizeof(key_block)); + + /* Generate Finished MAC */ + if (!EVP_DigestFinal_ex(&handshake_md5, handshake_hash, NULL) || + !EVP_DigestFinal_ex(&handshake_sha1, handshake_hash + EVP_MD_CTX_size(&handshake_md5), NULL)) + printf("EVP_DigestFinal_ex() failed\n"); + + do_PRF(TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, + handshake_hash, EVP_MD_CTX_size(&handshake_md5) + EVP_MD_CTX_size(&handshake_sha1), + NULL, 0, + finished_msg + DTLS1_HM_HEADER_LENGTH, TLS1_FINISH_MAC_LENGTH); + + return send_record(rbio, SSL3_RT_HANDSHAKE, 0, + finished_msg, sizeof(finished_msg)); +} + +static int validate_ccs(BIO *wbio) +{ + PACKET pkt; + long len; + unsigned char *data; + unsigned int u; + + len = BIO_get_mem_data(wbio, (char **)&data); + if (!PACKET_buf_init(&pkt, data, len)) + return 0; + + /* Check record header type */ + if (!PACKET_get_1(&pkt, &u) || u != SSL3_RT_CHANGE_CIPHER_SPEC) + return 0; + /* Version */ + if (!PACKET_get_net_2(&pkt, &u) || u != DTLS1_BAD_VER) + return 0; + /* Skip the rest of the record header */ + if (!PACKET_forward(&pkt, DTLS1_RT_HEADER_LENGTH - 3)) + return 0; + + /* Check ChangeCipherSpec message */ + if (!PACKET_get_1(&pkt, &u) || u != SSL3_MT_CCS) + return 0; + /* A DTLS1_BAD_VER ChangeCipherSpec also contains the + * handshake sequence number (which is 2 here) */ + if (!PACKET_get_net_2(&pkt, &u) || u != 0x0002) + return 0; + + /* Now check the Finished packet */ + if (!PACKET_get_1(&pkt, &u) || u != SSL3_RT_HANDSHAKE) + return 0; + if (!PACKET_get_net_2(&pkt, &u) || u != DTLS1_BAD_VER) + return 0; + + /* Check epoch is now 1 */ + if (!PACKET_get_net_2(&pkt, &u) || u != 0x0001) + return 0; + + /* That'll do for now. If OpenSSL accepted *our* Finished packet + * then it's evidently remembered that DTLS1_BAD_VER doesn't + * include the handshake header in the MAC. There's not a lot of + * point in implementing decryption here, just to check that it + * continues to get it right for one more packet. */ + + return 1; +} + +#define NODROP(x) { x##UL, 0 } +#define DROP(x) { x##UL, 1 } + +static struct { + unsigned long seq; + int drop; +} tests[] = { + NODROP(1), NODROP(3), NODROP(2), + NODROP(0x1234), NODROP(0x1230), NODROP(0x1235), + NODROP(0xffff), NODROP(0x10001), NODROP(0xfffe), NODROP(0x10000), + DROP(0x10001), DROP(0xff), NODROP(0x100000), NODROP(0x800000), NODROP(0x7fffe1), + NODROP(0xffffff), NODROP(0x1000000), NODROP(0xfffffe), DROP(0xffffff), NODROP(0x1000010), + NODROP(0xfffffd), NODROP(0x1000011), DROP(0x12), NODROP(0x1000012), + NODROP(0x1ffffff), NODROP(0x2000000), DROP(0x1ff00fe), NODROP(0x2000001), + NODROP(0x20fffff), NODROP(0x2105500), DROP(0x20ffffe), NODROP(0x21054ff), + NODROP(0x211ffff), DROP(0x2110000), NODROP(0x2120000) + /* The last test should be NODROP, because a DROP wouldn't get tested. */ +}; + +int main(int argc, char *argv[]) +{ + SSL_SESSION *sess; + SSL_CTX *ctx; + SSL *con; + BIO *rbio; + BIO *wbio; + BIO *err; + int testresult = 0; + int ret; + int i; + + SSL_library_init(); + SSL_load_error_strings(); + + err = BIO_new_fp(stderr, BIO_NOCLOSE | BIO_FP_TEXT); + + CRYPTO_malloc_debug_init(); + CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL); + CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON); + + RAND_bytes(session_id, sizeof(session_id)); + RAND_bytes(master_secret, sizeof(master_secret)); + RAND_bytes(cookie, sizeof(cookie)); + RAND_bytes(server_random + 4, sizeof(server_random) - 4); + time((void *)server_random); + + sess = client_session(); + if (sess == NULL) { + printf("Failed to generate SSL_SESSION\n"); + goto end; + } + + if (!EVP_DigestInit_ex(&handshake_md5, EVP_md5(), NULL) || + !EVP_DigestInit_ex(&handshake_sha1, EVP_sha1(), NULL)) { + printf("Failed to initialise handshake_md\n"); + goto end; + } + + ctx = SSL_CTX_new(DTLSv1_client_method()); + if (ctx == NULL) { + printf("Failed to allocate SSL_CTX\n"); + goto end_md; + } + SSL_CTX_set_options(ctx, SSL_OP_CISCO_ANYCONNECT); + + if (!SSL_CTX_set_cipher_list(ctx, "AES128-SHA")) { + printf("SSL_CTX_set_cipher_list() failed\n"); + goto end_ctx; + } + + con = SSL_new(ctx); + if (!SSL_set_session(con, sess)) { + printf("SSL_set_session() failed\n"); + goto end_con; + } + SSL_SESSION_free(sess); + + rbio = BIO_new(BIO_s_mem()); + wbio = BIO_new(BIO_s_mem()); + + BIO_set_nbio(rbio, 1); + BIO_set_nbio(wbio, 1); + + SSL_set_bio(con, rbio, wbio); + SSL_set_connect_state(con); + + /* Send initial ClientHello */ + ret = SSL_do_handshake(con); + if (ret > 0 || SSL_get_error(con, ret) != SSL_ERROR_WANT_READ) { + printf("Unexpected handshake result at initial call!\n"); + goto end_con; + } + + if (validate_client_hello(wbio) != 1) { + printf("Initial ClientHello failed validation\n"); + goto end_con; + } + if (send_hello_verify(rbio) != 1) { + printf("Failed to send HelloVerify\n"); + goto end_con; + } + ret = SSL_do_handshake(con); + if (ret > 0 || SSL_get_error(con, ret) != SSL_ERROR_WANT_READ) { + printf("Unexpected handshake result after HelloVerify!\n"); + goto end_con; + } + if (validate_client_hello(wbio) != 2) { + printf("Second ClientHello failed validation\n"); + goto end_con; + } + if (send_server_hello(rbio) != 1) { + printf("Failed to send ServerHello\n"); + goto end_con; + } + ret = SSL_do_handshake(con); + if (ret > 0 || SSL_get_error(con, ret) != SSL_ERROR_WANT_READ) { + printf("Unexpected handshake result after ServerHello!\n"); + goto end_con; + } + if (send_finished(con, rbio) != 1) { + printf("Failed to send Finished\n"); + goto end_con; + } + ret = SSL_do_handshake(con); + if (ret < 1) { + printf("Handshake not successful after Finished!\n"); + goto end_con; + } + if (validate_ccs(wbio) != 1) { + printf("Failed to validate client CCS/Finished\n"); + goto end_con; + } + + /* While we're here and crafting packets by hand, we might as well do a + bit of a stress test on the DTLS record replay handling. Not Cisco-DTLS + specific but useful anyway for the general case. It's been broken + before, and in fact was broken even for a basic 0, 2, 1 test case + when this test was first added.... */ + for (i = 0; i < (int)OSSL_NELEM(tests); i++) { + unsigned long recv_buf[2]; + + if (send_record(rbio, SSL3_RT_APPLICATION_DATA, tests[i].seq, + &tests[i].seq, sizeof(unsigned long)) != 1) { + printf("Failed to send data seq #0x%lx (%d)\n", + tests[i].seq, i); + goto end_con; + } + + if (tests[i].drop) + continue; + + ret = SSL_read(con, recv_buf, 2 * sizeof(unsigned long)); + if (ret != sizeof(unsigned long)) { + printf("SSL_read failed or wrong size on seq#0x%lx (%d)\n", + tests[i].seq, i); + goto end_con; + } + if (recv_buf[0] != tests[i].seq) { + printf("Wrong data packet received (0x%lx not 0x%lx) at packet %d\n", + recv_buf[0], tests[i].seq, i); + goto end_con; + } + } + if (tests[i-1].drop) { + printf("Error: last test cannot be DROP()\n"); + goto end_con; + } + testresult=1; + + end_con: + SSL_free(con); + end_ctx: + SSL_CTX_free(ctx); + end_md: + EVP_MD_CTX_cleanup(&handshake_md5); + EVP_MD_CTX_cleanup(&handshake_sha1); + end: + ERR_print_errors_fp(stderr); + + if (!testresult) { + printf("Cisco BadDTLS test: FAILED\n"); + } + + ERR_free_strings(); + ERR_remove_thread_state(NULL); + EVP_cleanup(); + CRYPTO_cleanup_all_ex_data(); + CRYPTO_mem_leaks(err); + BIO_free(err); + + return testresult?0:1; +} |
