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[70.77.224.58]) by smtp.gmail.com with ESMTPSA id y6sm18225685pjl.0.2021.01.02.07.47.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 Jan 2021 07:47:15 -0800 (PST) Sender: Sheng Mao Date: Sat, 2 Jan 2021 08:47:13 -0700 From: Sheng Mao To: Wang Yugui Cc: linux-btrfs@vger.kernel.org Subject: Re: [PATCH v2 1/3] btrfs-progs: add Kernel TLS to btrfs send/receive Message-ID: <20210102154713.GA2785@hosting.home> References: <20210101135350.AD49.409509F4@e16-tech.com> <20210102034957.2825531-1-shngmao@gmail.com> <20210102184531.9DC0.409509F4@e16-tech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210102184531.9DC0.409509F4@e16-tech.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Hi Yugui, Thank you for the benchmark! I forgot to mention the CRC. There is a faster version of CRC but current receive buffer `btrfs_send_stream::read_buf` is not aligned to unsigned long. I have made a patch to fix it: https://patchwork.kernel.org/project/linux-btrfs/patch/20201226214606.49241-1-shngmao@gmail.com/ The benchmark result is recorded in github issue #324: https://github.com/kdave/btrfs-progs/issues/324#issuecomment-751813175 In addition, on the server side, would you mind to try: btrfs-5.9 receive --listen-addr :: --tcp-port 8080 --dump &> /dev/null --dump only writes to stdout thus we can see network-only performance. Thank you! On Sat, Jan 02, 2021 at 06:45:32PM +0800, Wang Yugui wrote: > To: Sheng > > some test result on 10Gbps. > > Server:dell Precision T7610 Xeon(R) CPU E5-2660 v2 > Client: dell PowerEdge T620 Xeon(R) CPU E5-2680 v2 > OS: centos 8.3(gnutls-3.6.14-6.el8.x86_64) > > test script: > server=10.0.0.76 > ssh ${server} btrfs-5.9 subvolume delete /btrfs/movie2 > ssh ${server} /usr/bin/time btrfs-5.9 receive --listen-addr :: --tcp-port 8080 /btrfs & > sleep 2 > /usr/bin/time btrfs-5.9 send --conn-addr ${server} --tcp-port 8080 /archive/movie2 2>time.send > sleep 1 > cat time.send > > test result: > It works with about 200 MB/s. slow than expacted. > top result: > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 7479 root 20 0 45568 5200 4540 R 100.0 0.0 8:16.05 btrfs-5.9 receive --listen-addr > > #pstack 7479 > #0 __crc32c_le (crc=2848417421, data=0x7ffe68ee038b "\277g\276+\022\nZ", length=) at crypto/crc32c.c:213 > #1 0x00000000004637ed in crc32c_le (crc=crc@entry=0, data=data@entry=0x7ffe68edb004 "O\300", length=length@entry=49241) at crypto/crc32c.c:223 > #2 0x000000000045b71a in read_cmd (sctx=0x7ffe68edb000) at common/send-stream.c:141 > #3 read_and_process_cmd (sctx=0x7ffe68edb000) at common/send-stream.c:330 > > That is to say, for high speed network/disk config, the current bottleneck > of btrfs send/receive is the CRC process in btrfs receive side. > > Best Regards > Wang Yugui (wangyugui@e16-tech.com) > 2021/01/02 > > > From: Sheng Mao > > > > Currently, btrfs send outputs to a pipe or a file; > > btrfs receive inputs from a pipe or a file. > > The pipe can be a SSH or a stunnel connection. > > btrfs send/receive itself doesn't handle any connection. > > > > Kernel introduces TLS in version 4.13 (referred as ktls). > > Ktls provides a transparent TLS 1.2/1.3 connection: > > from user space aspect, applications use a normal socket > > fd to read/write from/to. This model fits into btrfs send's > > design well: btrfs first writes to a pipe and then splices > > data from pipe to the final fd (which is a file or pipe). > > Ktls simply replaces the final fd with the ktls socket fd. > > According to ktls' author, ktls can boost performance for > > 2~7%. Ktls helps less on receiving side: btrfs receive > > processes data in user space. But btrfs receive still can > > use transparent TLS layer. > > > > I have implemented ktls for btrfs send/receive. Here are > > the key features: > > > > - Use GnuTLS for handshake. OpenSSL is not suitable for this > > task, we need to pass IV and key from handshake session to > > kernel setting. > > - Use PSK (pre-shared key) for handshake. User can use --key > > to use a key file or input password on prompt. > > - Key file is checked as PEM format first; if it fails, key > > file is treated as raw binary file. > > - Three TLS modes are supported: none (raw TCP), TLS 1.2 + GCM > > 128/256, TLS 1.3 + GCM 128. > > - DTLS, certificate, Secure Remote Password (SRP) are not > > supported yet. > > > > Issue: #326 > > Signed-off-by: Sheng Mao > > --- > > common/ktls.c | 702 ++++++++++++++++++++++++++++++++++++++++++++++++++ > > common/ktls.h | 57 ++++ > > 2 files changed, 759 insertions(+) > > create mode 100644 common/ktls.c > > create mode 100644 common/ktls.h > > > > diff --git a/common/ktls.c b/common/ktls.c > > new file mode 100644 > > index 00000000..a4d670e3 > > --- /dev/null > > +++ b/common/ktls.c > > @@ -0,0 +1,702 @@ > > +/* > > + * Copyright (C) 2020 Sheng Mao. All rights reserved. > > + * > > + * This program is free software; you can redistribute it and/or > > + * modify it under the terms of the GNU General Public > > + * License v2 as published by the Free Software Foundation. > > + * > > + * This program is distributed in the hope that it will be useful, > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > > + * General Public License for more details. > > + */ > > + > > +#include > > +#include > > +#include > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#include > > + > > +#include > > + > > +#include > > + > > +#include "ktls.h" > > + > > +enum { KTLS_MAX_PASSWORD_LENGTH = 256, KTLS_MAX_PRIORITY_STRING_LENTH = 256 }; > > + > > +enum { > > + KTLS_STAGE_NOT_HANDSHAKED, > > + KTLS_STAGE_HAS_HANDSHAKED, > > +}; > > + > > +enum ktls_tls_mode_t { > > + KTLS_TLS_MODE_NONE = 0, > > + KTLS_TLS_12_128_GCM, > > + KTLS_TLS_13_128_GCM, > > + KTLS_TLS_12_256_GCM > > +}; > > + > > +struct ktls_session { > > + gnutls_session_t session; > > + gnutls_certificate_credentials_t crt_cred; > > + > > + gnutls_psk_server_credentials_t psk_cred_server; > > + gnutls_psk_client_credentials_t psk_cred_client; > > + > > + uint8_t role; > > + uint8_t stage; > > + enum ktls_tls_mode_t tls_mode; > > +}; > > + > > +static gnutls_datum_t ktls_psk_username = { 0 }; > > +static gnutls_datum_t ktls_psk_key = { 0 }; > > + > > +static void ktls_print_logs(int level, const char *msg) > > +{ > > + if (bconf.verbose >= level) > > + printf("GnuTLS [%d]: %s", level, msg); > > +} > > + > > +int ktls_set_psk_session_from_password_prompt(struct ktls_session *session, > > + const char *username) > > +{ > > + struct termios orig_term_flags, passwd_term_flags; > > + char passwd[KTLS_MAX_PASSWORD_LENGTH]; > > + int passwd_sz = 0; > > + int stdin_fd = 0; > > + > > + if (!session) > > + return EXIT_FAILURE; > > + > > + if (session->tls_mode == KTLS_TLS_MODE_NONE) > > + return EXIT_SUCCESS; > > + > > + passwd[0] = '\0'; > > + > > + stdin_fd = fileno(stdin); > > + > > + if (!isatty(stdin_fd)) { > > + error("tty needed for password input"); > > + return EXIT_FAILURE; > > + } > > + > > + tcgetattr(stdin_fd, &orig_term_flags); > > + passwd_term_flags = orig_term_flags; > > + passwd_term_flags.c_lflag &= ~ECHO; > > + passwd_term_flags.c_lflag |= ECHONL; > > + > > + if (tcsetattr(stdin_fd, TCSANOW, &passwd_term_flags)) { > > + error("fail to hide password: %s", strerror(errno)); > > + return EXIT_FAILURE; > > + } > > + > > + printf("password: "); > > + if (!fgets(passwd, sizeof(passwd), stdin)) { > > + error("no password read"); > > + return EXIT_FAILURE; > > + } > > + > > + if (tcsetattr(fileno(stdin), TCSANOW, &orig_term_flags)) { > > + error("fail to reset tty: %s", strerror(errno)); > > + return EXIT_FAILURE; > > + } > > + > > + passwd_sz = strlen(passwd); > > + if (passwd_sz <= 0) { > > + error("no password read"); > > + return EXIT_FAILURE; > > + } > > + if (passwd[passwd_sz - 1] == '\n') { > > + passwd[passwd_sz - 1] = '\0'; > > + passwd_sz--; > > + } > > + > > + return ktls_set_psk_session(session, username, > > + (const unsigned char *)passwd, passwd_sz); > > +} > > + > > +int ktls_set_psk_session_from_keyfile(struct ktls_session *session, > > + const char *username, > > + const char *key_file) > > +{ > > + int rc = GNUTLS_E_SUCCESS; > > + struct stat file_stat; > > + size_t sz = 0; > > + FILE *fp = NULL; > > + gnutls_datum_t input = { NULL, 0UL }; > > + gnutls_datum_t output = { NULL, 0UL }; > > + > > + if (!session) > > + goto cleanup; > > + > > + if (session->tls_mode == KTLS_TLS_MODE_NONE) > > + return EXIT_SUCCESS; > > + > > + if (stat(key_file, &file_stat)) { > > + error("fail to open keyfile: %s", strerror(errno)); > > + goto cleanup; > > + } > > + > > + fp = fopen(key_file, "r"); > > + if (!fp) { > > + error("fail to open keyfile: %s", strerror(errno)); > > + goto cleanup; > > + } > > + > > + input.size = file_stat.st_size; > > + > > + input.data = gnutls_malloc(input.size); > > + > > + sz = fread(input.data, 1, input.size, fp); > > + > > + if (sz != input.size) { > > + error("fail to read PEM"); > > + goto cleanup; > > + } > > + > > + rc = gnutls_pem_base64_decode2(NULL, &input, &output); > > + if (rc != GNUTLS_E_SUCCESS) { > > + error("Error! fail to decode PEM: %s", gnutls_strerror(rc)); > > + goto cleanup; > > + } > > + > > + return ktls_set_psk_session(session, username, output.data, > > + output.size); > > + > > +cleanup: > > + return EXIT_FAILURE; > > +} > > + > > +struct ktls_session *ktls_create_session(bool is_sender) > > +{ > > + struct ktls_session *session = NULL; > > + > > + session = (struct ktls_session *)malloc(sizeof(struct ktls_session)); > > + explicit_bzero(session, sizeof(*session)); > > + > > + gnutls_global_init(); > > + > > + session->role = is_sender ? GNUTLS_CLIENT : GNUTLS_SERVER; > > + session->stage = KTLS_STAGE_NOT_HANDSHAKED; > > + > > + gnutls_init(&session->session, session->role); > > + > > + gnutls_global_set_log_level(bconf.verbose); > > + gnutls_global_set_log_function(ktls_print_logs); > > + > > + return session; > > +} > > + > > +void ktls_destroy_session(struct ktls_session *session) > > +{ > > + if (!session) > > + return; > > + > > + if (session->crt_cred) > > + gnutls_certificate_free_credentials(session->crt_cred); > > + > > + if (session->psk_cred_server) > > + gnutls_psk_free_server_credentials(session->psk_cred_server); > > + > > + if (session->psk_cred_client) > > + gnutls_psk_free_client_credentials(session->psk_cred_client); > > + > > + if (session->session) { > > + if (session->stage == KTLS_STAGE_HAS_HANDSHAKED) > > + gnutls_bye(session->session, GNUTLS_SHUT_RDWR); > > + gnutls_deinit(session->session); > > + } > > + > > + gnutls_global_deinit(); > > + > > + explicit_bzero(session, sizeof(*session)); > > +} > > + > > +static int ktls_connect_or_bind(int *sock, bool is_sender, int protocol, > > + struct sockaddr *serv_addr, size_t serv_addr_sz) > > +{ > > + *sock = 0; > > + > > + *sock = socket(protocol, SOCK_STREAM, 0); > > + if (*sock == KTLS_INVALID_FD) { > > + error("could not create socket: %s", strerror(errno)); > > + goto cleanup; > > + } > > + > > + if (is_sender) { > > + if (connect(*sock, serv_addr, serv_addr_sz)) { > > + error("fail to connect to server: %s", strerror(errno)); > > + goto cleanup; > > + } > > + return EXIT_SUCCESS; > > + } > > + > > + if (setsockopt(*sock, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, > > + sizeof(int))) { > > + error("fail to connect to server: %s", strerror(errno)); > > + goto cleanup; > > + } > > + > > + if (bind(*sock, serv_addr, serv_addr_sz) || listen(*sock, 1)) { > > + error("fail to serve as server: %s", strerror(errno)); > > + goto cleanup; > > + } > > + > > + return EXIT_SUCCESS; > > + > > +cleanup: > > + if (*sock >= 0) > > + close(*sock); > > + return EXIT_FAILURE; > > +} > > + > > +static int ktls_connect_domain(int *sock, bool is_sender, const char *host, > > + const uint16_t port) > > +{ > > + struct addrinfo hints = { 0 }, *res = NULL; > > + int rc = 0; > > + struct sockaddr_in addr4; > > + struct sockaddr_in6 addr6; > > + > > + memset(&hints, 0, sizeof(hints)); > > + > > + hints.ai_family = PF_UNSPEC; > > + hints.ai_socktype = SOCK_STREAM; > > + hints.ai_flags |= AI_CANONNAME; > > + > > + if (getaddrinfo(host, NULL, &hints, &res)) { > > + error("fail to get address info: %s", strerror(errno)); > > + return EXIT_FAILURE; > > + } > > + > > + while (res) { > > + switch (res->ai_family) { > > + case AF_INET: > > + explicit_bzero(&addr4, sizeof(addr4)); > > + addr4.sin_addr = > > + ((struct sockaddr_in *)res->ai_addr)->sin_addr; > > + addr4.sin_port = port; > > + addr4.sin_family = res->ai_family; > > + if (!ktls_connect_or_bind( > > + sock, is_sender, res->ai_family, > > + (struct sockaddr *)&addr4, sizeof(addr4))) { > > + goto cleanup; > > + } > > + break; > > + case AF_INET6: > > + explicit_bzero(&addr6, sizeof(addr6)); > > + addr6.sin6_addr = > > + ((struct sockaddr_in6 *)res->ai_addr)->sin6_addr; > > + addr6.sin6_port = port; > > + addr6.sin6_family = res->ai_family; > > + if (!ktls_connect_or_bind( > > + sock, is_sender, res->ai_family, > > + (struct sockaddr *)&addr6, sizeof(addr6))) { > > + goto cleanup; > > + } > > + break; > > + } > > + res = res->ai_next; > > + } > > + > > + freeaddrinfo(res); > > + return EXIT_FAILURE; > > + > > +cleanup: > > + freeaddrinfo(res); > > + return rc; > > +} > > + > > +static int ktls_connect_ip(int *sock, bool is_sender, const char *host, > > + const uint16_t port) > > +{ > > + struct sockaddr_in addr4; > > + struct sockaddr_in6 addr6; > > + struct sockaddr *serv_addr = NULL; > > + size_t serv_addr_sz = 0; > > + sa_family_t protol = AF_INET; > > + > > + explicit_bzero(&addr4, sizeof(addr4)); > > + explicit_bzero(&addr6, sizeof(addr6)); > > + > > + if (inet_pton(AF_INET, host, &addr4.sin_addr) == 1) { > > + serv_addr = (struct sockaddr *)&addr4; > > + serv_addr_sz = sizeof(addr4); > > + protol = addr4.sin_family = AF_INET; > > + addr4.sin_port = port; > > + } > > + > > + if (!serv_addr && inet_pton(AF_INET6, host, &addr6.sin6_addr) == 1) { > > + serv_addr = (struct sockaddr *)&addr6; > > + serv_addr_sz = sizeof(addr6); > > + protol = addr6.sin6_family = AF_INET6; > > + addr6.sin6_port = port; > > + } > > + > > + if (!serv_addr) > > + return KTLS_INVALID_FD; > > + > > + return ktls_connect_or_bind(sock, is_sender, protol, serv_addr, > > + serv_addr_sz); > > +} > > + > > +int ktls_set_tls_mode(struct ktls_session *session, const char *mode) > > +{ > > + if (!session) > > + return EXIT_FAILURE; > > + > > + if (!strcmp("none", mode)) > > + session->tls_mode = KTLS_TLS_MODE_NONE; > > + else if (!strcmp("tls_12_128_gcm", mode)) > > + session->tls_mode = KTLS_TLS_12_128_GCM; > > + else if (!strcmp("tls_13_128_gcm", mode)) > > + session->tls_mode = KTLS_TLS_13_128_GCM; > > + else if (!strcmp("tls_12_256_gcm", mode)) > > + session->tls_mode = KTLS_TLS_12_256_GCM; > > + else { > > + error("unknown tls mode: %s", mode); > > + return EXIT_FAILURE; > > + } > > + return EXIT_SUCCESS; > > +} > > + > > +#define INIT_GCM_WITH_MODE(V, X) \ > > + { \ > > + struct tls12_crypto_info_aes_gcm_##X crypto_info; \ > > +\ > > + crypto_info.info.version = TLS_##V##_VERSION; \ > > + crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_##X; \ > > + memcpy(crypto_info.iv, seq_number, \ > > + TLS_CIPHER_AES_GCM_##X##_IV_SIZE); \ > > + memcpy(crypto_info.rec_seq, seq_number, \ > > + TLS_CIPHER_AES_GCM_##X##_REC_SEQ_SIZE); \ > > + if (cipher_key.size != TLS_CIPHER_AES_GCM_##X##_KEY_SIZE) { \ > > + error("mismatch in send key size: %d != %d\n", \ > > + cipher_key.size, \ > > + TLS_CIPHER_AES_GCM_##X##_KEY_SIZE); \ > > + goto cleanup; \ > > + } \ > > + memcpy(crypto_info.key, cipher_key.data, \ > > + TLS_CIPHER_AES_GCM_##X##_KEY_SIZE); \ > > + memcpy(crypto_info.salt, iv.data, \ > > + TLS_CIPHER_AES_GCM_##X##_SALT_SIZE); \ > > + if (setsockopt(sock, SOL_TLS, is_sender ? TLS_TX : TLS_RX, \ > > + &crypto_info, sizeof(crypto_info))) { \ > > + error("fail to set kernel tls: %s", strerror(errno)); \ > > + goto cleanup; \ > > + } \ > > + } > > + > > +int ktls_handshake_tls(struct ktls_session *session, int sock) > > +{ > > + int rc = 0; > > + bool is_sender = false; > > + int handshake_retry = 3; > > + char tls_priority_list[KTLS_MAX_PRIORITY_STRING_LENTH]; > > + const char *tls_priority_templ = > > + "NONE:+MAC-ALL:+COMP-NULL:+SIGN-ALL:+GROUP-ALL:+ECDHE-PSK:+DHE-PSK:%s:%s"; > > + const char *tls_priority_ver_mode = NULL; > > + > > + gnutls_datum_t mac_key; > > + gnutls_datum_t iv; > > + gnutls_datum_t cipher_key; > > + unsigned char seq_number[8]; > > + > > + if (!session || !session->session) > > + return EXIT_FAILURE; > > + > > + switch (session->tls_mode) { > > + case KTLS_TLS_MODE_NONE: > > + return EXIT_SUCCESS; > > + case KTLS_TLS_12_128_GCM: > > + tls_priority_ver_mode = "+VERS-TLS1.2:+AES-128-GCM"; > > + break; > > + case KTLS_TLS_13_128_GCM: > > + tls_priority_ver_mode = "+VERS-TLS1.3:+AES-128-GCM"; > > + break; > > + case KTLS_TLS_12_256_GCM: > > + tls_priority_ver_mode = "+VERS-TLS1.2:+AES-256-GCM"; > > + break; > > + default: > > + error("unknown tls mode"); > > + goto cleanup; > > + } > > + > > + is_sender = session->role == GNUTLS_CLIENT; > > + > > + if (is_sender && session->psk_cred_client) { > > + rc = gnutls_credentials_set(session->session, GNUTLS_CRD_PSK, > > + session->psk_cred_client); > > + if (rc != GNUTLS_E_SUCCESS) { > > + error("fail to set PSK for client: %s", > > + gnutls_strerror(rc)); > > + goto cleanup; > > + } > > + } > > + > > + if (!is_sender && session->psk_cred_server) { > > + rc = gnutls_credentials_set(session->session, GNUTLS_CRD_PSK, > > + session->psk_cred_server); > > + if (rc != GNUTLS_E_SUCCESS) { > > + error("fail to set PSK for server: %s", > > + gnutls_strerror(rc)); > > + goto cleanup; > > + } > > + } > > + > > + if (session->crt_cred) { > > + rc = gnutls_credentials_set(session->session, > > + GNUTLS_CRD_CERTIFICATE, > > + session->crt_cred); > > + > > + if (rc == GNUTLS_E_SUCCESS) { > > + error("fail to set certificate: %s", > > + gnutls_strerror(rc)); > > + goto cleanup; > > + } > > + } > > + > > + snprintf(tls_priority_list, KTLS_MAX_PRIORITY_STRING_LENTH, > > + tls_priority_templ, > > + is_sender ? "+CTYPE-CLI-ALL" : "+CTYPE-SRV-ALL", > > + tls_priority_ver_mode); > > + > > + rc = gnutls_priority_set_direct(session->session, tls_priority_list, > > + NULL); > > + if (rc != GNUTLS_E_SUCCESS) { > > + error("fail to set priority: %s", gnutls_strerror(rc)); > > + goto cleanup; > > + } > > + > > + gnutls_transport_set_int(session->session, sock); > > + > > + gnutls_handshake_set_timeout(session->session, > > + GNUTLS_DEFAULT_HANDSHAKE_TIMEOUT); > > + > > + do { > > + if (handshake_retry < 0) { > > + error("exhaust retries on handshake"); > > + break; > > + } > > + rc = gnutls_handshake(session->session); > > + handshake_retry--; > > + } while (rc < 0 && !gnutls_error_is_fatal(rc)); > > + > > + if (gnutls_error_is_fatal(rc)) { > > + error("fail on handshake: %s", gnutls_strerror(rc)); > > + goto cleanup; > > + } > > + if (bconf.verbose > 0) { > > + char *desc = gnutls_session_get_desc(session->session); > > + > > + printf("TLS session info: %s\n", desc); > > + gnutls_free(desc); > > + } > > + > > + session->stage = KTLS_STAGE_HAS_HANDSHAKED; > > + > > + rc = gnutls_record_get_state(session->session, is_sender ? 0 : 1, > > + &mac_key, &iv, &cipher_key, seq_number); > > + if (rc != GNUTLS_E_SUCCESS) { > > + error("fail on retrieve TLS record: %s", gnutls_strerror(rc)); > > + goto cleanup; > > + } > > + > > + if (setsockopt(sock, SOL_TCP, TCP_ULP, "tls", sizeof("tls"))) { > > + error("fail to set kernel TLS on socket: %s", strerror(errno)); > > + goto cleanup; > > + } > > + > > + switch (session->tls_mode) { > > + case KTLS_TLS_12_128_GCM: > > + INIT_GCM_WITH_MODE(1_2, 128); > > + break; > > + case KTLS_TLS_13_128_GCM: > > + INIT_GCM_WITH_MODE(1_3, 128); > > + break; > > + case KTLS_TLS_12_256_GCM: > > + INIT_GCM_WITH_MODE(1_2, 256); > > + break; > > + default: > > + error("unknown tls mode"); > > + goto cleanup; > > + } > > + > > + if (bconf.verbose > 0) > > + fprintf(stderr, "ktls init done\n"); > > + > > + return EXIT_SUCCESS; > > + > > +cleanup: > > + return EXIT_FAILURE; > > +} > > + > > +static int ktls_cp_datum(gnutls_datum_t *to, const gnutls_datum_t *from) > > +{ > > + if (!to || !from) > > + return EXIT_FAILURE; > > + > > + to->size = from->size; > > + to->data = (unsigned char *)gnutls_malloc(to->size); > > + memmove(to->data, from->data, to->size); > > + > > + return EXIT_SUCCESS; > > +} > > + > > +static int ktls_cmp_datum(const gnutls_datum_t *lhs, const gnutls_datum_t *rhs) > > +{ > > + if (!lhs && !rhs) > > + return EXIT_SUCCESS; > > + > > + if (!lhs || !rhs) > > + return EXIT_FAILURE; > > + > > + if (lhs->size != rhs->size) > > + return EXIT_FAILURE; > > + > > + return memcmp(lhs->data, rhs->data, lhs->size); > > +} > > + > > +static int ktls_set_datum(gnutls_datum_t *to, const unsigned char *from, > > + int from_size) > > +{ > > + if (!to || !from || !from_size) > > + return EXIT_FAILURE; > > + > > + if (from_size < 0) > > + from_size = strlen((const char *)from); > > + > > + to->size = from_size; > > + to->data = (unsigned char *)gnutls_malloc(to->size); > > + memmove(to->data, from, from_size); > > + > > + return EXIT_SUCCESS; > > +} > > + > > +static int tls_psk_client_callback(gnutls_session_t session, > > + gnutls_datum_t *username, > > + gnutls_datum_t *key) > > +{ > > + if (ktls_cp_datum(username, &ktls_psk_username) || > > + ktls_cp_datum(key, &ktls_psk_key)) > > + return EXIT_FAILURE; > > + > > + return EXIT_SUCCESS; > > +} > > + > > +static int tls_psk_server_callback(gnutls_session_t session, > > + const gnutls_datum_t *username, > > + gnutls_datum_t *key) > > +{ > > + if (ktls_cmp_datum(username, &ktls_psk_username) || > > + ktls_cp_datum(key, &ktls_psk_key)) > > + return EXIT_FAILURE; > > + > > + return EXIT_SUCCESS; > > +} > > + > > +int ktls_set_psk_session(struct ktls_session *session, const char *username, > > + const unsigned char *passwd, const size_t sz_passwd) > > +{ > > + bool is_sender = false; > > + int rc = 0; > > + > > + if (!session || !session->session) > > + goto cleanup; > > + > > + is_sender = session->role == GNUTLS_CLIENT; > > + > > + if (!is_sender && !session->psk_cred_server) { > > + rc = gnutls_psk_allocate_server_credentials( > > + &session->psk_cred_server); > > + if (rc != GNUTLS_E_SUCCESS) { > > + error("fail on set psk for server: %s", > > + gnutls_strerror(rc)); > > + goto cleanup; > > + } > > + gnutls_psk_set_server_credentials_function2( > > + session->psk_cred_server, tls_psk_server_callback); > > + } > > + > > + if (is_sender && !session->psk_cred_client) { > > + rc = gnutls_psk_allocate_client_credentials( > > + &session->psk_cred_client); > > + if (rc != GNUTLS_E_SUCCESS) { > > + error("fail on set psk for client: %s", > > + gnutls_strerror(rc)); > > + goto cleanup; > > + } > > + gnutls_psk_set_client_credentials_function2( > > + session->psk_cred_client, tls_psk_client_callback); > > + } > > + > > + if (!ktls_psk_key.size) > > + gnutls_free(ktls_psk_key.data); > > + > > + if (!ktls_psk_username.size) > > + gnutls_free(ktls_psk_username.data); > > + > > + if (ktls_set_datum(&ktls_psk_username, (const unsigned char *)username, > > + -1) || > > + ktls_set_datum(&ktls_psk_key, passwd, sz_passwd)) > > + goto cleanup; > > + > > + return EXIT_SUCCESS; > > + > > +cleanup: > > + return EXIT_FAILURE; > > +} > > + > > +int ktls_create_sock_oneshot(struct ktls_session *session, const char *host, > > + const char *port) > > +{ > > + int sock = 0; > > + int nport = 0; > > + bool is_sender; > > + > > + if (!session || !session->session) > > + return EXIT_FAILURE; > > + > > + is_sender = session->role == GNUTLS_CLIENT; > > + > > + nport = atoi(port); > > + > > + if (nport >= 0 && nport <= 65535) > > + nport = htons((uint16_t)nport); > > + > > + if (ktls_connect_ip(&sock, is_sender, host, (uint16_t)nport)) > > + if (ktls_connect_domain(&sock, is_sender, host, nport)) > > + goto cleanup; > > + > > + if (!is_sender) { > > + int accepted_sock = KTLS_INVALID_FD; > > + > > + accepted_sock = accept(sock, (struct sockaddr *)NULL, NULL); > > + close(sock); > > + sock = accepted_sock; > > + } > > + > > + if (ktls_handshake_tls(session, sock)) > > + goto cleanup; > > + > > + return sock; > > + > > +cleanup: > > + close(sock); > > + return KTLS_INVALID_FD; > > +} > > diff --git a/common/ktls.h b/common/ktls.h > > new file mode 100644 > > index 00000000..d744e18e > > --- /dev/null > > +++ b/common/ktls.h > > @@ -0,0 +1,57 @@ > > +/* > > + * Copyright (C) 2020 Sheng Mao. All rights reserved. > > + * > > + * This program is free software; you can redistribute it and/or > > + * modify it under the terms of the GNU General Public > > + * License v2 as published by the Free Software Foundation. > > + * > > + * This program is distributed in the hope that it will be useful, > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > > + * General Public License for more details. > > + */ > > + > > +#ifndef __BTRFS_KTLS_H__ > > +#define __BTRFS_KTLS_H__ > > + > > +#include > > +#include > > + > > +#ifdef __cplusplus > > +extern "C" { > > +#endif > > + > > +struct ktls_session; > > + > > +enum { KTLS_INVALID_FD = -1 }; > > + > > +struct ktls_session *ktls_create_session(bool is_sender); > > +void ktls_destroy_session(struct ktls_session *session); > > + > > +// ktls_set_psk_session sets PSK (pre-shared key). username is NULL-terminated > > +// string; passwd is sized string. Memory of both strings are managed by > > +// caller. currently, this API only allows to set PSK before calling > > +// ktls_handshake_*() > > +int ktls_set_psk_session(struct ktls_session *session, const char *username, > > + const unsigned char *passwd, const size_t sz_passwd); > > + > > +int ktls_set_psk_session_from_password_prompt(struct ktls_session *session, > > + const char *username); > > + > > +int ktls_set_psk_session_from_keyfile(struct ktls_session *session, > > + const char *username, > > + const char *key_file); > > + > > +int ktls_set_tls_mode(struct ktls_session *session, const char *mode); > > + > > +int ktls_handshake_tls(struct ktls_session *session, int sock); > > + > > +// ktls_create_sock_oneshot returns a sock fd on success. > > +int ktls_create_sock_oneshot(struct ktls_session *session, const char *host, > > + const char *port); > > + > > +#ifdef __cplusplus > > +} > > +#endif > > + > > +#endif // __BTRFS_KTLS_H__ > > -- > > 2.29.2 > >