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BearSSL/tools/client.c

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/*
* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include "brssl.h"
#include "bearssl.h"
static int
host_connect(const char *host, const char *port, int verbose)
{
struct addrinfo hints, *si, *p;
int fd;
int err;
memset(&hints, 0, sizeof hints);
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
err = getaddrinfo(host, port, &hints, &si);
if (err != 0) {
fprintf(stderr, "ERROR: getaddrinfo(): %s\n",
gai_strerror(err));
return -1;
}
fd = -1;
for (p = si; p != NULL; p = p->ai_next) {
if (verbose) {
struct sockaddr *sa;
void *addr;
char tmp[INET6_ADDRSTRLEN + 50];
sa = (struct sockaddr *)p->ai_addr;
if (sa->sa_family == AF_INET) {
addr = &((struct sockaddr_in *)sa)->sin_addr;
} else if (sa->sa_family == AF_INET6) {
addr = &((struct sockaddr_in6 *)sa)->sin6_addr;
} else {
addr = NULL;
}
if (addr != NULL) {
if (!inet_ntop(p->ai_family, addr,
tmp, sizeof tmp))
{
strcpy(tmp, "<invalid>");
}
} else {
sprintf(tmp, "<unknown family: %d>",
(int)sa->sa_family);
}
fprintf(stderr, "connecting to: %s\n", tmp);
}
fd = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
if (fd < 0) {
if (verbose) {
perror("socket()");
}
continue;
}
if (connect(fd, p->ai_addr, p->ai_addrlen) < 0) {
if (verbose) {
perror("connect()");
}
close(fd);
continue;
}
break;
}
if (p == NULL) {
freeaddrinfo(si);
fprintf(stderr, "ERROR: failed to connect\n");
return -1;
}
freeaddrinfo(si);
if (verbose) {
fprintf(stderr, "connected.\n");
}
/*
* We make the socket non-blocking, since we are going to use
* poll() to organise I/O.
*/
fcntl(fd, F_SETFL, O_NONBLOCK);
return fd;
}
static void
usage_client(void)
{
fprintf(stderr,
"usage: brssl client server[:port] [ options ]\n");
fprintf(stderr,
"options:\n");
fprintf(stderr,
" -q suppress verbose messages\n");
fprintf(stderr,
" -trace activate extra debug messages (dump of all packets)\n");
fprintf(stderr,
" -sni name use this specific name for SNI\n");
fprintf(stderr,
" -nosni do not send any SNI\n");
fprintf(stderr,
" -mono use monodirectional buffering\n");
fprintf(stderr,
" -buf length set the I/O buffer length (in bytes)\n");
fprintf(stderr,
" -CA file add certificates in 'file' to trust anchors\n");
fprintf(stderr,
" -list list supported names (protocols, algorithms...)\n");
fprintf(stderr,
" -vmin name set minimum supported version (default: TLS-1.0)\n");
fprintf(stderr,
" -vmax name set maximum supported version (default: TLS-1.2)\n");
fprintf(stderr,
" -cs names set list of supported cipher suites (comma-separated)\n");
fprintf(stderr,
" -hf names add support for some hash functions (comma-separated)\n");
fprintf(stderr,
" -minhello len set minimum ClientHello length (in bytes)\n");
fprintf(stderr,
" -fallback send the TLS_FALLBACK_SCSV (i.e. claim a downgrade)\n");
}
/* see brssl.h */
int
do_client(int argc, char *argv[])
{
int retcode;
int verbose;
int trace;
int i, bidi;
const char *server_name;
char *host;
char *port;
const char *sni;
anchor_list anchors = VEC_INIT;
unsigned vmin, vmax;
cipher_suite *suites;
size_t num_suites;
uint16_t *suite_ids;
unsigned hfuns;
size_t u;
br_ssl_client_context cc;
br_x509_minimal_context xc;
x509_noanchor_context xwc;
const br_hash_class *dnhash;
unsigned char *iobuf;
size_t iobuf_len;
size_t minhello_len;
int fallback;
int fd;
retcode = 0;
verbose = 1;
trace = 0;
server_name = NULL;
host = NULL;
port = NULL;
sni = NULL;
bidi = 1;
vmin = 0;
vmax = 0;
suites = NULL;
num_suites = 0;
hfuns = 0;
suite_ids = NULL;
iobuf = NULL;
iobuf_len = 0;
minhello_len = (size_t)-1;
fallback = 0;
fd = -1;
for (i = 0; i < argc; i ++) {
const char *arg;
arg = argv[i];
if (arg[0] != '-') {
if (server_name != NULL) {
fprintf(stderr,
"ERROR: duplicate server name\n");
usage_client();
goto client_exit_error;
}
server_name = arg;
continue;
}
if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
verbose = 1;
} else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
verbose = 0;
} else if (eqstr(arg, "-trace")) {
trace = 1;
} else if (eqstr(arg, "-sni")) {
if (++ i >= argc) {
fprintf(stderr,
"ERROR: no argument for '-sni'\n");
usage_client();
goto client_exit_error;
}
if (sni != NULL) {
fprintf(stderr, "ERROR: duplicate SNI\n");
usage_client();
goto client_exit_error;
}
sni = argv[i];
} else if (eqstr(arg, "-nosni")) {
if (sni != NULL) {
fprintf(stderr, "ERROR: duplicate SNI\n");
usage_client();
goto client_exit_error;
}
sni = "";
} else if (eqstr(arg, "-mono")) {
bidi = 0;
} else if (eqstr(arg, "-buf")) {
if (++ i >= argc) {
fprintf(stderr,
"ERROR: no argument for '-buf'\n");
usage_client();
goto client_exit_error;
}
arg = argv[i];
if (iobuf_len != 0) {
fprintf(stderr,
"ERROR: duplicate I/O buffer length\n");
usage_client();
goto client_exit_error;
}
iobuf_len = parse_size(arg);
if (iobuf_len == (size_t)-1) {
usage_client();
goto client_exit_error;
}
} else if (eqstr(arg, "-CA")) {
if (++ i >= argc) {
fprintf(stderr,
"ERROR: no argument for '-CA'\n");
usage_client();
goto client_exit_error;
}
arg = argv[i];
if (read_trust_anchors(&anchors, arg) == 0) {
usage_client();
goto client_exit_error;
}
} else if (eqstr(arg, "-list")) {
list_names();
goto client_exit;
} else if (eqstr(arg, "-vmin")) {
if (++ i >= argc) {
fprintf(stderr,
"ERROR: no argument for '-vmin'\n");
usage_client();
goto client_exit_error;
}
arg = argv[i];
if (vmin != 0) {
fprintf(stderr,
"ERROR: duplicate minimum version\n");
usage_client();
goto client_exit_error;
}
vmin = parse_version(arg, strlen(arg));
if (vmin == 0) {
fprintf(stderr,
"ERROR: unrecognised version '%s'\n",
arg);
usage_client();
goto client_exit_error;
}
} else if (eqstr(arg, "-vmax")) {
if (++ i >= argc) {
fprintf(stderr,
"ERROR: no argument for '-vmax'\n");
usage_client();
goto client_exit_error;
}
arg = argv[i];
if (vmax != 0) {
fprintf(stderr,
"ERROR: duplicate maximum version\n");
usage_client();
goto client_exit_error;
}
vmax = parse_version(arg, strlen(arg));
if (vmax == 0) {
fprintf(stderr,
"ERROR: unrecognised version '%s'\n",
arg);
usage_client();
goto client_exit_error;
}
} else if (eqstr(arg, "-cs")) {
if (++ i >= argc) {
fprintf(stderr,
"ERROR: no argument for '-cs'\n");
usage_client();
goto client_exit_error;
}
arg = argv[i];
if (suites != NULL) {
fprintf(stderr, "ERROR: duplicate list"
" of cipher suites\n");
usage_client();
goto client_exit_error;
}
suites = parse_suites(arg, &num_suites);
if (suites == NULL) {
usage_client();
goto client_exit_error;
}
} else if (eqstr(arg, "-hf")) {
unsigned x;
if (++ i >= argc) {
fprintf(stderr,
"ERROR: no argument for '-hf'\n");
usage_client();
goto client_exit_error;
}
arg = argv[i];
x = parse_hash_functions(arg);
if (x == 0) {
usage_client();
goto client_exit_error;
}
hfuns |= x;
} else if (eqstr(arg, "-minhello")) {
if (++ i >= argc) {
fprintf(stderr,
"ERROR: no argument for '-minhello'\n");
usage_client();
goto client_exit_error;
}
arg = argv[i];
if (minhello_len != (size_t)-1) {
fprintf(stderr, "ERROR: duplicate minium"
" ClientHello length\n");
usage_client();
goto client_exit_error;
}
minhello_len = parse_size(arg);
/*
* Minimum ClientHello length must fit on 16 bits.
*/
if (minhello_len == (size_t)-1
|| (((minhello_len >> 12) >> 4) != 0))
{
usage_client();
goto client_exit_error;
}
} else if (eqstr(arg, "-fallback")) {
fallback = 1;
} else {
fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
usage_client();
goto client_exit_error;
}
}
if (server_name == NULL) {
fprintf(stderr, "ERROR: no server name/address provided\n");
usage_client();
goto client_exit_error;
}
for (u = strlen(server_name); u > 0; u --) {
int c = server_name[u - 1];
if (c == ':') {
break;
}
if (c < '0' || c > '9') {
u = 0;
break;
}
}
if (u == 0) {
host = xstrdup(server_name);
port = "443";
} else {
port = xstrdup(server_name + u);
host = xmalloc(u);
memcpy(host, server_name, u - 1);
host[u - 1] = 0;
}
if (sni == NULL) {
sni = host;
}
if (vmin == 0) {
vmin = BR_TLS10;
}
if (vmax == 0) {
vmax = BR_TLS12;
}
if (vmax < vmin) {
fprintf(stderr, "ERROR: impossible minimum/maximum protocol"
" version combination\n");
usage_client();
goto client_exit_error;
}
if (suites == NULL) {
num_suites = 0;
for (u = 0; cipher_suites[u].name; u ++) {
if ((cipher_suites[u].req & REQ_TLS12) == 0
|| vmax >= BR_TLS12)
{
num_suites ++;
}
}
suites = xmalloc(num_suites * sizeof *suites);
num_suites = 0;
for (u = 0; cipher_suites[u].name; u ++) {
if ((cipher_suites[u].req & REQ_TLS12) == 0
|| vmax >= BR_TLS12)
{
suites[num_suites ++] = cipher_suites[u];
}
}
}
if (hfuns == 0) {
hfuns = (unsigned)-1;
}
if (iobuf_len == 0) {
if (bidi) {
iobuf_len = BR_SSL_BUFSIZE_BIDI;
} else {
iobuf_len = BR_SSL_BUFSIZE_MONO;
}
}
iobuf = xmalloc(iobuf_len);
/*
* Compute implementation requirements and inject implementations.
*/
suite_ids = xmalloc((num_suites + 1) * sizeof *suite_ids);
br_ssl_client_zero(&cc);
br_ssl_engine_set_versions(&cc.eng, vmin, vmax);
dnhash = NULL;
for (u = 0; hash_functions[u].name; u ++) {
const br_hash_class *hc;
int id;
hc = hash_functions[u].hclass;
id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
if ((hfuns & ((unsigned)1 << id)) != 0) {
dnhash = hc;
}
}
if (dnhash == NULL) {
fprintf(stderr, "ERROR: no supported hash function\n");
goto client_exit_error;
}
br_x509_minimal_init(&xc, dnhash,
&VEC_ELT(anchors, 0), VEC_LEN(anchors));
if (vmin <= BR_TLS11) {
if (!(hfuns & (1 << br_md5_ID))) {
fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need MD5\n");
goto client_exit_error;
}
if (!(hfuns & (1 << br_sha1_ID))) {
fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need SHA-1\n");
goto client_exit_error;
}
}
for (u = 0; u < num_suites; u ++) {
unsigned req;
req = suites[u].req;
suite_ids[u] = suites[u].suite;
if ((req & REQ_TLS12) != 0 && vmax < BR_TLS12) {
fprintf(stderr,
"ERROR: cipher suite %s requires TLS 1.2\n",
suites[u].name);
goto client_exit_error;
}
if ((req & REQ_SHA1) != 0 && !(hfuns & (1 << br_sha1_ID))) {
fprintf(stderr,
"ERROR: cipher suite %s requires SHA-1\n",
suites[u].name);
goto client_exit_error;
}
if ((req & REQ_SHA256) != 0 && !(hfuns & (1 << br_sha256_ID))) {
fprintf(stderr,
"ERROR: cipher suite %s requires SHA-256\n",
suites[u].name);
goto client_exit_error;
}
if ((req & REQ_SHA384) != 0 && !(hfuns & (1 << br_sha384_ID))) {
fprintf(stderr,
"ERROR: cipher suite %s requires SHA-384\n",
suites[u].name);
goto client_exit_error;
}
/* TODO: algorithm implementation selection */
if ((req & REQ_AESCBC) != 0) {
br_ssl_engine_set_aes_cbc(&cc.eng,
&br_aes_ct_cbcenc_vtable,
&br_aes_ct_cbcdec_vtable);
br_ssl_engine_set_cbc(&cc.eng,
&br_sslrec_in_cbc_vtable,
&br_sslrec_out_cbc_vtable);
}
if ((req & REQ_AESGCM) != 0) {
br_ssl_engine_set_aes_ctr(&cc.eng,
&br_aes_ct_ctr_vtable);
br_ssl_engine_set_ghash(&cc.eng,
&br_ghash_ctmul);
br_ssl_engine_set_gcm(&cc.eng,
&br_sslrec_in_gcm_vtable,
&br_sslrec_out_gcm_vtable);
}
if ((req & REQ_3DESCBC) != 0) {
br_ssl_engine_set_des_cbc(&cc.eng,
&br_des_ct_cbcenc_vtable,
&br_des_ct_cbcdec_vtable);
br_ssl_engine_set_cbc(&cc.eng,
&br_sslrec_in_cbc_vtable,
&br_sslrec_out_cbc_vtable);
}
if ((req & REQ_RSAKEYX) != 0) {
br_ssl_client_set_rsapub(&cc, &br_rsa_i31_public);
}
if ((req & REQ_ECDHE_RSA) != 0) {
br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
br_ssl_client_set_rsavrfy(&cc, &br_rsa_i31_pkcs1_vrfy);
}
if ((req & REQ_ECDHE_ECDSA) != 0) {
br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
br_ssl_client_set_ecdsa(&cc, &br_ecdsa_i31_vrfy_asn1);
}
if ((req & REQ_ECDH) != 0) {
br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
}
}
if (fallback) {
suite_ids[num_suites ++] = 0x5600;
}
br_ssl_engine_set_suites(&cc.eng, suite_ids, num_suites);
for (u = 0; hash_functions[u].name; u ++) {
const br_hash_class *hc;
int id;
hc = hash_functions[u].hclass;
id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
if ((hfuns & ((unsigned)1 << id)) != 0) {
br_ssl_engine_set_hash(&cc.eng, id, hc);
br_x509_minimal_set_hash(&xc, id, hc);
}
}
if (vmin <= BR_TLS11) {
br_ssl_engine_set_prf10(&cc.eng, &br_tls10_prf);
}
if (vmax >= BR_TLS12) {
if ((hfuns & ((unsigned)1 << br_sha256_ID)) != 0) {
br_ssl_engine_set_prf_sha256(&cc.eng,
&br_tls12_sha256_prf);
}
if ((hfuns & ((unsigned)1 << br_sha384_ID)) != 0) {
br_ssl_engine_set_prf_sha384(&cc.eng,
&br_tls12_sha384_prf);
}
}
br_x509_minimal_set_rsa(&xc, &br_rsa_i31_pkcs1_vrfy);
br_x509_minimal_set_ecdsa(&xc,
&br_ec_prime_i31, &br_ecdsa_i31_vrfy_asn1);
/*
* If there is no provided trust anchor, then certificate validation
* will always fail. In that situation, we use our custom wrapper
* that tolerates unknown anchors.
*/
if (VEC_LEN(anchors) == 0) {
if (verbose) {
fprintf(stderr,
"WARNING: no configured trust anchor\n");
}
x509_noanchor_init(&xwc, &xc.vtable);
br_ssl_engine_set_x509(&cc.eng, &xwc.vtable);
} else {
br_ssl_engine_set_x509(&cc.eng, &xc.vtable);
}
if (minhello_len != (size_t)-1) {
br_ssl_client_set_min_clienthello_len(&cc, minhello_len);
}
br_ssl_engine_set_buffer(&cc.eng, iobuf, iobuf_len, bidi);
br_ssl_client_reset(&cc, sni, 0);
/*
* We need to avoid SIGPIPE.
*/
signal(SIGPIPE, SIG_IGN);
/*
* Connect to the peer.
*/
fd = host_connect(host, port, verbose);
if (fd < 0) {
goto client_exit_error;
}
/*
* Run the engine until completion.
*/
if (run_ssl_engine(&cc.eng, fd,
(verbose ? RUN_ENGINE_VERBOSE : 0)
| (trace ? RUN_ENGINE_TRACE : 0)) != 0)
{
goto client_exit_error;
} else {
goto client_exit;
}
/*
* Release allocated structures.
*/
client_exit:
xfree(host);
xfree(suites);
xfree(suite_ids);
VEC_CLEAREXT(anchors, &free_ta_contents);
xfree(iobuf);
if (fd >= 0) {
close(fd);
}
return retcode;
client_exit_error:
retcode = -1;
goto client_exit;
}
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