BOOL rdp_server_establish_keys(rdpRdp* rdp, wStream* s) { BYTE client_random[64]; /* Should be only 32 after successful decryption, but on failure might take up to 64 bytes. */ BYTE crypt_client_random[256 + 8]; UINT32 rand_len, key_len; UINT16 channel_id, length, sec_flags; BYTE* mod; BYTE* priv_exp; if (!rdp->settings->DisableEncryption) { /* No RDP Security. */ return TRUE; } if (!rdp_read_header(rdp, s, &length, &channel_id)) { fprintf(stderr, "rdp_server_establish_keys: invalid RDP header\n"); return FALSE; } if (!rdp_read_security_header(s, &sec_flags)) return FALSE; if ((sec_flags & SEC_EXCHANGE_PKT) == 0) { fprintf(stderr, "rdp_server_establish_keys: missing SEC_EXCHANGE_PKT in security header\n"); return FALSE; } if (Stream_GetRemainingLength(s) < 4) return FALSE; Stream_Read_UINT32(s, rand_len); if (Stream_GetRemainingLength(s) < rand_len + 8) /* include 8 bytes of padding */ return FALSE; key_len = rdp->settings->RdpServerRsaKey->ModulusLength; if (rand_len != key_len + 8) { fprintf(stderr, "rdp_server_establish_keys: invalid encrypted client random length\n"); return FALSE; } ZeroMemory(crypt_client_random, sizeof(crypt_client_random)); Stream_Read(s, crypt_client_random, rand_len); /* 8 zero bytes of padding */ Stream_Seek(s, 8); mod = rdp->settings->RdpServerRsaKey->Modulus; priv_exp = rdp->settings->RdpServerRsaKey->PrivateExponent; crypto_rsa_private_decrypt(crypt_client_random, rand_len - 8, key_len, mod, priv_exp, client_random); /* now calculate encrypt / decrypt and update keys */ if (!security_establish_keys(client_random, rdp)) { return FALSE; } rdp->do_crypt = TRUE; if (rdp->settings->SaltedChecksum) rdp->do_secure_checksum = TRUE; if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS) { rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec); rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec); rdp->fips_hmac = crypto_hmac_new(); return TRUE; } rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len); rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len); return TRUE; }
static boolean rdp_server_establish_keys(rdpRdp* rdp, STREAM* s) { uint8 client_random[64]; /* Should be only 32 after successfull decryption, but on failure might take up to 64 bytes. */ uint8 crypt_client_random[256 + 8]; uint32 rand_len, key_len; uint16 channel_id, length, sec_flags; uint8* mod; uint8* priv_exp; if (rdp->settings->encryption == false) { /* No RDP Security. */ return true; } if (!rdp_read_header(rdp, s, &length, &channel_id)) { printf("rdp_server_establish_keys: invalid RDP header\n"); return false; } rdp_read_security_header(s, &sec_flags); if ((sec_flags & SEC_EXCHANGE_PKT) == 0) { printf("rdp_server_establish_keys: missing SEC_EXCHANGE_PKT in security header\n"); return false; } stream_read_uint32(s, rand_len); key_len = rdp->settings->server_key->modulus.length; if (rand_len != key_len + 8) { printf("rdp_server_establish_keys: invalid encrypted client random length\n"); return false; } memset(crypt_client_random, 0, sizeof(crypt_client_random)); stream_read(s, crypt_client_random, rand_len); /* 8 zero bytes of padding */ stream_seek(s, 8); mod = rdp->settings->server_key->modulus.data; priv_exp = rdp->settings->server_key->private_exponent.data; crypto_rsa_private_decrypt(crypt_client_random, rand_len - 8, key_len, mod, priv_exp, client_random); /* now calculate encrypt / decrypt and update keys */ if (!security_establish_keys(client_random, rdp)) { return false; } rdp->do_crypt = true; if (rdp->settings->salted_checksum) rdp->do_secure_checksum = true; if (rdp->settings->encryption_method == ENCRYPTION_METHOD_FIPS) { uint8 fips_ivec[8] = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec); rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec); rdp->fips_hmac = crypto_hmac_new(); return true; } rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len); rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len); return true; }
static BOOL rdp_client_establish_keys(rdpRdp* rdp) { BYTE* mod; BYTE* exp; wStream* s; UINT32 length; UINT32 key_len; BYTE crypt_client_random[256 + 8]; if (!rdp->settings->DisableEncryption) { /* no RDP encryption */ return TRUE; } /* encrypt client random */ if (rdp->settings->ClientRandom) free(rdp->settings->ClientRandom); rdp->settings->ClientRandom = malloc(CLIENT_RANDOM_LENGTH); if (!rdp->settings->ClientRandom) return FALSE; ZeroMemory(crypt_client_random, sizeof(crypt_client_random)); crypto_nonce(rdp->settings->ClientRandom, CLIENT_RANDOM_LENGTH); key_len = rdp->settings->RdpServerCertificate->cert_info.ModulusLength; mod = rdp->settings->RdpServerCertificate->cert_info.Modulus; exp = rdp->settings->RdpServerCertificate->cert_info.exponent; crypto_rsa_public_encrypt(rdp->settings->ClientRandom, CLIENT_RANDOM_LENGTH, key_len, mod, exp, crypt_client_random); /* send crypt client random to server */ length = RDP_PACKET_HEADER_MAX_LENGTH + RDP_SECURITY_HEADER_LENGTH + 4 + key_len + 8; s = Stream_New(NULL, length); rdp_write_header(rdp, s, length, MCS_GLOBAL_CHANNEL_ID); rdp_write_security_header(s, SEC_EXCHANGE_PKT); length = key_len + 8; Stream_Write_UINT32(s, length); Stream_Write(s, crypt_client_random, length); Stream_SealLength(s); if (transport_write(rdp->mcs->transport, s) < 0) { return FALSE; } Stream_Free(s, TRUE); /* now calculate encrypt / decrypt and update keys */ if (!security_establish_keys(rdp->settings->ClientRandom, rdp)) { return FALSE; } rdp->do_crypt = TRUE; if (rdp->settings->SaltedChecksum) rdp->do_secure_checksum = TRUE; if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS) { rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec); rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec); rdp->fips_hmac = crypto_hmac_new(); return TRUE; } rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len); rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len); return TRUE; }
static boolean rdp_client_establish_keys(rdpRdp* rdp) { uint8 client_random[CLIENT_RANDOM_LENGTH]; uint8 crypt_client_random[256 + 8]; uint32 key_len; uint8* mod; uint8* exp; uint32 length; STREAM* s; if (rdp->settings->encryption == false) { /* no RDP encryption */ return true; } /* encrypt client random */ memset(crypt_client_random, 0, sizeof(crypt_client_random)); crypto_nonce(client_random, sizeof(client_random)); key_len = rdp->settings->server_cert->cert_info.modulus.length; mod = rdp->settings->server_cert->cert_info.modulus.data; exp = rdp->settings->server_cert->cert_info.exponent; crypto_rsa_public_encrypt(client_random, sizeof(client_random), key_len, mod, exp, crypt_client_random); /* send crypt client random to server */ length = RDP_PACKET_HEADER_MAX_LENGTH + RDP_SECURITY_HEADER_LENGTH + 4 + key_len + 8; s = transport_send_stream_init(rdp->mcs->transport, length); rdp_write_header(rdp, s, length, MCS_GLOBAL_CHANNEL_ID); rdp_write_security_header(s, SEC_EXCHANGE_PKT); length = key_len + 8; stream_write_uint32(s, length); stream_write(s, crypt_client_random, length); if (transport_write(rdp->mcs->transport, s) < 0) { return false; } /* now calculate encrypt / decrypt and update keys */ if (!security_establish_keys(client_random, rdp)) { return false; } rdp->do_crypt = true; if (rdp->settings->salted_checksum) rdp->do_secure_checksum = true; if (rdp->settings->encryption_method == ENCRYPTION_METHOD_FIPS) { uint8 fips_ivec[8] = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec); rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec); rdp->fips_hmac = crypto_hmac_new(); return true; } rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len); rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len); return true; }
static boolean rdp_establish_keys(rdpRdp* rdp) { uint8 client_random[32]; uint8 crypt_client_random[256 + 8]; uint32 key_len; uint8* mod; uint8* exp; uint32 length; STREAM* s; if (rdp->settings->encryption == False) { /* no RDP encryption */ return True; } /* encrypt client random */ memset(crypt_client_random, 0, sizeof(crypt_client_random)); memset(client_random, 0x5e, 32); crypto_nonce(client_random, 32); key_len = rdp->settings->server_cert->cert_info.modulus.length; mod = rdp->settings->server_cert->cert_info.modulus.data; exp = rdp->settings->server_cert->cert_info.exponent; crypto_rsa_encrypt(client_random, 32, key_len, mod, exp, crypt_client_random); /* send crypt client random to server */ length = 7 + 8 + 4 + 4 + key_len + 8; s = transport_send_stream_init(rdp->mcs->transport, length); tpkt_write_header(s, length); tpdu_write_header(s, 2, 0xf0); per_write_choice(s, DomainMCSPDU_SendDataRequest << 2); per_write_integer16(s, rdp->mcs->user_id, MCS_BASE_CHANNEL_ID); per_write_integer16(s, MCS_GLOBAL_CHANNEL_ID, 0); stream_write_uint8(s, 0x70); length = (4 + 4 + key_len + 8) | 0x8000; stream_write_uint16_be(s, length); stream_write_uint32(s, 1); /* SEC_CLIENT_RANDOM */ length = key_len + 8; stream_write_uint32(s, length); memcpy(s->p, crypt_client_random, length); stream_seek(s, length); if (transport_write(rdp->mcs->transport, s) < 0) { return False; } /* now calculate encrypt / decrypt and update keys */ if (!security_establish_keys(client_random, rdp)) { return False; } rdp->do_crypt = True; if (rdp->settings->encryption_method == ENCRYPTION_METHOD_FIPS) { uint8 fips_ivec[8] = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec); rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec); rdp->fips_hmac = crypto_hmac_new(); return True; } rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len); rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len); return True; }
BOOL rdp_server_establish_keys(rdpRdp* rdp, wStream* s) { BYTE* client_random = NULL; BYTE* crypt_client_random = NULL; UINT32 rand_len, key_len; UINT16 channel_id, length, sec_flags; BYTE* mod; BYTE* priv_exp; BOOL ret = FALSE; if (!rdp->settings->DisableEncryption) { /* No RDP Security. */ return TRUE; } if (!rdp_read_header(rdp, s, &length, &channel_id)) { WLog_ERR(TAG, "invalid RDP header"); return FALSE; } if (!rdp_read_security_header(s, &sec_flags)) { WLog_ERR(TAG, "invalid security header"); return FALSE; } if ((sec_flags & SEC_EXCHANGE_PKT) == 0) { WLog_ERR(TAG, "missing SEC_EXCHANGE_PKT in security header"); return FALSE; } rdp->do_crypt_license = (sec_flags & SEC_LICENSE_ENCRYPT_SC) != 0 ? TRUE : FALSE; if (Stream_GetRemainingLength(s) < 4) return FALSE; Stream_Read_UINT32(s, rand_len); /* rand_len already includes 8 bytes of padding */ if (Stream_GetRemainingLength(s) < rand_len) return FALSE; key_len = rdp->settings->RdpServerRsaKey->ModulusLength; client_random = malloc(key_len); if (!client_random) return FALSE; if (rand_len != key_len + 8) { WLog_ERR(TAG, "invalid encrypted client random length"); goto end2; } crypt_client_random = calloc(1, rand_len); if (!crypt_client_random) goto end2; Stream_Read(s, crypt_client_random, rand_len); mod = rdp->settings->RdpServerRsaKey->Modulus; priv_exp = rdp->settings->RdpServerRsaKey->PrivateExponent; crypto_rsa_private_decrypt(crypt_client_random, rand_len - 8, key_len, mod, priv_exp, client_random); /* now calculate encrypt / decrypt and update keys */ if (!security_establish_keys(client_random, rdp)) { goto end; } rdp->do_crypt = TRUE; if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS) { rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec); if (!rdp->fips_encrypt) { WLog_ERR(TAG, "unable to allocate des3 encrypt key"); goto end; } rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec); if (!rdp->fips_decrypt) { WLog_ERR(TAG, "unable to allocate des3 decrypt key"); goto end; } rdp->fips_hmac = crypto_hmac_new(); if (!rdp->fips_hmac) { WLog_ERR(TAG, "unable to allocate fips hmac"); goto end; } ret = TRUE; goto end; } rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len); if (!rdp->rc4_decrypt_key) { WLog_ERR(TAG, "unable to allocate rc4 decrypt key"); goto end; } rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len); if (!rdp->rc4_encrypt_key) { WLog_ERR(TAG, "unable to allocate rc4 encrypt key"); goto end; } ret = TRUE; end: if (crypt_client_random) free(crypt_client_random); end2: if (client_random) free(client_random); return ret; }
static BOOL rdp_client_establish_keys(rdpRdp* rdp) { BYTE* mod; BYTE* exp; wStream* s; UINT32 length; UINT32 key_len; int status = 0; BOOL ret = FALSE; rdpSettings* settings; BYTE* crypt_client_random = NULL; settings = rdp->settings; if (!settings->DisableEncryption) { /* no RDP encryption */ return TRUE; } /* encrypt client random */ if (settings->ClientRandom) free(settings->ClientRandom); settings->ClientRandomLength = CLIENT_RANDOM_LENGTH; settings->ClientRandom = malloc(settings->ClientRandomLength); if (!settings->ClientRandom) return FALSE; crypto_nonce(settings->ClientRandom, settings->ClientRandomLength); key_len = settings->RdpServerCertificate->cert_info.ModulusLength; mod = settings->RdpServerCertificate->cert_info.Modulus; exp = settings->RdpServerCertificate->cert_info.exponent; /* * client random must be (bitlen / 8) + 8 - see [MS-RDPBCGR] 5.3.4.1 * for details */ crypt_client_random = calloc(1, key_len + 8); if (!crypt_client_random) return FALSE; crypto_rsa_public_encrypt(settings->ClientRandom, settings->ClientRandomLength, key_len, mod, exp, crypt_client_random); /* send crypt client random to server */ length = RDP_PACKET_HEADER_MAX_LENGTH + RDP_SECURITY_HEADER_LENGTH + 4 + key_len + 8; s = Stream_New(NULL, length); rdp_write_header(rdp, s, length, MCS_GLOBAL_CHANNEL_ID); rdp_write_security_header(s, SEC_EXCHANGE_PKT | SEC_LICENSE_ENCRYPT_SC); length = key_len + 8; Stream_Write_UINT32(s, length); Stream_Write(s, crypt_client_random, length); Stream_SealLength(s); status = transport_write(rdp->mcs->transport, s); Stream_Free(s, TRUE); if (status < 0) goto end; rdp->do_crypt_license = TRUE; /* now calculate encrypt / decrypt and update keys */ if (!security_establish_keys(settings->ClientRandom, rdp)) goto end; rdp->do_crypt = TRUE; if (settings->SaltedChecksum) rdp->do_secure_checksum = TRUE; if (settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS) { rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec); if (!rdp->fips_encrypt) { WLog_ERR(TAG, "unable to allocate des3 encrypt key"); goto end; } rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec); if (!rdp->fips_decrypt) { WLog_ERR(TAG, "unable to allocate des3 decrypt key"); goto end; } rdp->fips_hmac = crypto_hmac_new(); if (!rdp->fips_hmac) { WLog_ERR(TAG, "unable to allocate fips hmac"); goto end; } ret = TRUE; goto end; } rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len); if (!rdp->rc4_decrypt_key) { WLog_ERR(TAG, "unable to allocate rc4 decrypt key"); goto end; } rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len); if (!rdp->rc4_encrypt_key) { WLog_ERR(TAG, "unable to allocate rc4 encrypt key"); goto end; } ret = TRUE; end: if (crypt_client_random) free(crypt_client_random); return ret; }
BOOL rdp_server_establish_keys(rdpRdp* rdp, wStream* s) { BYTE* client_random = NULL; BYTE* crypt_client_random = NULL; UINT32 rand_len, key_len; UINT16 channel_id, length, sec_flags; BYTE* mod; BYTE* priv_exp; BOOL ret = FALSE; if (!rdp->settings->UseRdpSecurityLayer) { /* No RDP Security. */ return TRUE; } if (!rdp_read_header(rdp, s, &length, &channel_id)) { WLog_ERR(TAG, "invalid RDP header"); return FALSE; } if (!rdp_read_security_header(s, &sec_flags, NULL)) { WLog_ERR(TAG, "invalid security header"); return FALSE; } if ((sec_flags & SEC_EXCHANGE_PKT) == 0) { WLog_ERR(TAG, "missing SEC_EXCHANGE_PKT in security header"); return FALSE; } rdp->do_crypt_license = (sec_flags & SEC_LICENSE_ENCRYPT_SC) != 0 ? TRUE : FALSE; if (Stream_GetRemainingLength(s) < 4) return FALSE; Stream_Read_UINT32(s, rand_len); /* rand_len already includes 8 bytes of padding */ if (Stream_GetRemainingLength(s) < rand_len) return FALSE; key_len = rdp->settings->RdpServerRsaKey->ModulusLength; client_random = malloc(key_len); if (!client_random) return FALSE; if (rand_len != key_len + 8) { WLog_ERR(TAG, "invalid encrypted client random length"); free(client_random); goto end; } crypt_client_random = calloc(1, rand_len); if (!crypt_client_random) { free(client_random); goto end; } Stream_Read(s, crypt_client_random, rand_len); mod = rdp->settings->RdpServerRsaKey->Modulus; priv_exp = rdp->settings->RdpServerRsaKey->PrivateExponent; if (crypto_rsa_private_decrypt(crypt_client_random, rand_len - 8, key_len, mod, priv_exp, client_random) <= 0) { free(client_random); goto end; } rdp->settings->ClientRandom = client_random; rdp->settings->ClientRandomLength = 32; /* now calculate encrypt / decrypt and update keys */ if (!security_establish_keys(client_random, rdp)) goto end; rdp->do_crypt = TRUE; if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS) { rdp->fips_encrypt = winpr_Cipher_New(WINPR_CIPHER_DES_EDE3_CBC, WINPR_ENCRYPT, rdp->fips_encrypt_key, fips_ivec); if (!rdp->fips_encrypt) { WLog_ERR(TAG, "unable to allocate des3 encrypt key"); goto end; } rdp->fips_decrypt = winpr_Cipher_New(WINPR_CIPHER_DES_EDE3_CBC, WINPR_DECRYPT, rdp->fips_decrypt_key, fips_ivec); if (!rdp->fips_decrypt) { WLog_ERR(TAG, "unable to allocate des3 decrypt key"); goto end; } ret = TRUE; goto end; } rdp->rc4_decrypt_key = winpr_RC4_New(rdp->decrypt_key, rdp->rc4_key_len); rdp->rc4_encrypt_key = winpr_RC4_New(rdp->encrypt_key, rdp->rc4_key_len); if (!rdp->rc4_decrypt_key || !rdp->rc4_encrypt_key) goto end; ret = TRUE; end: free(crypt_client_random); if (!ret) { winpr_Cipher_Free(rdp->fips_encrypt); winpr_Cipher_Free(rdp->fips_decrypt); winpr_RC4_Free(rdp->rc4_encrypt_key); winpr_RC4_Free(rdp->rc4_decrypt_key); rdp->fips_encrypt = NULL; rdp->fips_decrypt = NULL; rdp->rc4_encrypt_key = NULL; rdp->rc4_decrypt_key = NULL; } return ret; }