#include "setup.h"
#ifdef USE_GNUTLS
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gcrypt.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include "urldata.h"
#include "sendf.h"
#include "inet_pton.h"
#include "gtls.h"
#include "sslgen.h"
#include "parsedate.h"
#include "connect.h"
#include "select.h"
#include "rawstr.h"
#define _MPRINTF_REPLACE
#include <curl/mprintf.h>
#include "curl_memory.h"
#include "memdebug.h"
#ifndef GNUTLS_POINTER_TO_INT_CAST
#define GNUTLS_POINTER_TO_INT_CAST(p) ((int) (long) (p))
#endif
#ifndef GNUTLS_INT_TO_POINTER_CAST
#define GNUTLS_INT_TO_POINTER_CAST(i) ((void*) (long) (i))
#endif
#ifdef GTLSDEBUG
static void tls_log_func(int level, const char *str)
{
fprintf(stderr, "|<%d>| %s", level, str);
}
#endif
static bool gtls_inited = FALSE;
static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
{
return swrite(GNUTLS_POINTER_TO_INT_CAST(s), buf, len);
}
static ssize_t Curl_gtls_pull(void *s, void *buf, size_t len)
{
return sread(GNUTLS_POINTER_TO_INT_CAST(s), buf, len);
}
int Curl_gtls_init(void)
{
int ret = 1;
if(!gtls_inited) {
ret = gnutls_global_init()?0:1;
#ifdef GTLSDEBUG
gnutls_global_set_log_function(tls_log_func);
gnutls_global_set_log_level(2);
#endif
gtls_inited = TRUE;
}
return ret;
}
int Curl_gtls_cleanup(void)
{
if(gtls_inited) {
gnutls_global_deinit();
gtls_inited = FALSE;
}
return 1;
}
static void showtime(struct SessionHandle *data,
const char *text,
time_t stamp)
{
struct tm *tm;
#ifdef HAVE_GMTIME_R
struct tm buffer;
tm = (struct tm *)gmtime_r(&stamp, &buffer);
#else
tm = gmtime(&stamp);
#endif
snprintf(data->state.buffer,
BUFSIZE,
"\t %s: %s, %02d %s %4d %02d:%02d:%02d GMT\n",
text,
Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
tm->tm_mday,
Curl_month[tm->tm_mon],
tm->tm_year + 1900,
tm->tm_hour,
tm->tm_min,
tm->tm_sec);
infof(data, "%s", data->state.buffer);
}
static gnutls_datum load_file (const char *file)
{
FILE *f;
gnutls_datum loaded_file = { NULL, 0 };
long filelen;
void *ptr;
if (!(f = fopen(file, "r")))
return loaded_file;
if (fseek(f, 0, SEEK_END) != 0
|| (filelen = ftell(f)) < 0
|| fseek(f, 0, SEEK_SET) != 0
|| !(ptr = malloc((size_t)filelen)))
goto out;
if (fread(ptr, 1, (size_t)filelen, f) < (size_t)filelen) {
free(ptr);
goto out;
}
loaded_file.data = ptr;
loaded_file.size = (unsigned int)filelen;
out:
fclose(f);
return loaded_file;
}
static void unload_file(gnutls_datum data) {
free(data.data);
}
static CURLcode handshake(struct connectdata *conn,
gnutls_session session,
int sockindex,
bool duringconnect)
{
struct SessionHandle *data = conn->data;
int rc;
if(!gtls_inited)
Curl_gtls_init();
do {
rc = gnutls_handshake(session);
if((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED)) {
long timeout_ms = Curl_timeleft(conn, NULL, duringconnect);
if(timeout_ms < 0) {
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
rc = Curl_socket_ready(conn->sock[sockindex],
conn->sock[sockindex], (int)timeout_ms);
if(rc > 0)
continue;
else if(0 == rc) {
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
else {
failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
return CURLE_SSL_CONNECT_ERROR;
}
}
else
break;
} while(1);
if(rc < 0) {
failf(data, "gnutls_handshake() failed: %s", gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
return CURLE_OK;
}
static gnutls_x509_crt_fmt do_file_type(const char *type)
{
if(!type || !type[0])
return GNUTLS_X509_FMT_PEM;
if(Curl_raw_equal(type, "PEM"))
return GNUTLS_X509_FMT_PEM;
if(Curl_raw_equal(type, "DER"))
return GNUTLS_X509_FMT_DER;
return -1;
}
CURLcode
Curl_gtls_connect(struct connectdata *conn,
int sockindex)
{
static const int cert_type_priority[] = { GNUTLS_CRT_X509, 0 };
struct SessionHandle *data = conn->data;
gnutls_session session;
int rc;
unsigned int cert_list_size;
const gnutls_datum *chainp;
unsigned int verify_status;
gnutls_x509_crt x509_cert,x509_issuer;
gnutls_datum issuerp;
char certbuf[256];
size_t size;
unsigned int algo;
unsigned int bits;
time_t certclock;
const char *ptr;
void *ssl_sessionid;
size_t ssl_idsize;
bool sni = TRUE;
#ifdef ENABLE_IPV6
struct in6_addr addr;
#else
struct in_addr addr;
#endif
if(conn->ssl[sockindex].state == ssl_connection_complete)
return CURLE_OK;
if(!gtls_inited)
Curl_gtls_init();
if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
failf(data, "GnuTLS does not support SSLv2");
return CURLE_SSL_CONNECT_ERROR;
}
else if(data->set.ssl.version == CURL_SSLVERSION_SSLv3)
sni = FALSE;
rc = gnutls_certificate_allocate_credentials(&conn->ssl[sockindex].cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_cert_all_cred() failed: %s", gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
if(data->set.ssl.CAfile) {
gnutls_certificate_set_verify_flags(conn->ssl[sockindex].cred,
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
rc = gnutls_certificate_set_x509_trust_file(conn->ssl[sockindex].cred,
data->set.ssl.CAfile,
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
infof(data, "error reading ca cert file %s (%s)\n",
data->set.ssl.CAfile, gnutls_strerror(rc));
if(data->set.ssl.verifypeer)
return CURLE_SSL_CACERT_BADFILE;
}
else
infof(data, "found %d certificates in %s\n",
rc, data->set.ssl.CAfile);
}
if(data->set.ssl.CRLfile) {
rc = gnutls_certificate_set_x509_crl_file(conn->ssl[sockindex].cred,
data->set.ssl.CRLfile,
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
failf(data, "error reading crl file %s (%s)\n",
data->set.ssl.CRLfile, gnutls_strerror(rc));
return CURLE_SSL_CRL_BADFILE;
}
else
infof(data, "found %d CRL in %s\n",
rc, data->set.ssl.CRLfile);
}
rc = gnutls_init(&conn->ssl[sockindex].session, GNUTLS_CLIENT);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_init() failed: %d", rc);
return CURLE_SSL_CONNECT_ERROR;
}
session = conn->ssl[sockindex].session;
if ((0 == Curl_inet_pton(AF_INET, conn->host.name, &addr)) &&
#ifdef ENABLE_IPV6
(0 == Curl_inet_pton(AF_INET6, conn->host.name, &addr)) &&
#endif
sni &&
(gnutls_server_name_set(session, GNUTLS_NAME_DNS, conn->host.name,
strlen(conn->host.name)) < 0))
infof(data, "WARNING: failed to configure server name indication (SNI) "
"TLS extension\n");
rc = gnutls_set_default_priority(session);
if(rc != GNUTLS_E_SUCCESS)
return CURLE_SSL_CONNECT_ERROR;
if(data->set.ssl.version == CURL_SSLVERSION_SSLv3) {
static const int protocol_priority[] = { GNUTLS_SSL3, 0 };
gnutls_protocol_set_priority(session, protocol_priority);
if(rc != GNUTLS_E_SUCCESS)
return CURLE_SSL_CONNECT_ERROR;
}
rc = gnutls_certificate_type_set_priority(session, cert_type_priority);
if(rc != GNUTLS_E_SUCCESS)
return CURLE_SSL_CONNECT_ERROR;
if(data->set.str[STRING_CERT]) {
if( gnutls_certificate_set_x509_key_file(
conn->ssl[sockindex].cred,
data->set.str[STRING_CERT],
data->set.str[STRING_KEY] ?
data->set.str[STRING_KEY] : data->set.str[STRING_CERT],
do_file_type(data->set.str[STRING_CERT_TYPE]) ) != GNUTLS_E_SUCCESS) {
failf(data, "error reading X.509 key or certificate file");
return CURLE_SSL_CONNECT_ERROR;
}
}
rc = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
conn->ssl[sockindex].cred);
gnutls_transport_set_ptr(session,
GNUTLS_INT_TO_POINTER_CAST(conn->sock[sockindex]));
gnutls_transport_set_push_function(session, Curl_gtls_push);
gnutls_transport_set_pull_function(session, Curl_gtls_pull);
gnutls_transport_set_lowat(session, 0);
if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize)) {
gnutls_session_set_data(session, ssl_sessionid, ssl_idsize);
infof (data, "SSL re-using session ID\n");
}
rc = handshake(conn, session, sockindex, TRUE);
if(rc)
return rc;
chainp = gnutls_certificate_get_peers(session, &cert_list_size);
if(!chainp) {
if(data->set.ssl.verifypeer ||
data->set.ssl.verifyhost ||
data->set.ssl.issuercert) {
failf(data, "failed to get server cert");
return CURLE_PEER_FAILED_VERIFICATION;
}
infof(data, "\t common name: WARNING couldn't obtain\n");
}
if(data->set.ssl.verifypeer) {
rc = gnutls_certificate_verify_peers2(session, &verify_status);
if(rc < 0) {
failf(data, "server cert verify failed: %d", rc);
return CURLE_SSL_CONNECT_ERROR;
}
if(verify_status & GNUTLS_CERT_INVALID) {
if(data->set.ssl.verifypeer) {
failf(data, "server certificate verification failed. CAfile: %s "
"CRLfile: %s", data->set.ssl.CAfile?data->set.ssl.CAfile:"none",
data->set.ssl.CRLfile?data->set.ssl.CRLfile:"none");
return CURLE_SSL_CACERT;
}
else
infof(data, "\t server certificate verification FAILED\n");
}
else
infof(data, "\t server certificate verification OK\n");
}
else
infof(data, "\t server certificate verification SKIPPED\n");
gnutls_x509_crt_init(&x509_cert);
gnutls_x509_crt_import(x509_cert, chainp, GNUTLS_X509_FMT_DER);
if (data->set.ssl.issuercert) {
gnutls_x509_crt_init(&x509_issuer);
issuerp = load_file(data->set.ssl.issuercert);
gnutls_x509_crt_import(x509_issuer, &issuerp, GNUTLS_X509_FMT_PEM);
rc = gnutls_x509_crt_check_issuer(x509_cert,x509_issuer);
unload_file(issuerp);
if (rc <= 0) {
failf(data, "server certificate issuer check failed (IssuerCert: %s)",
data->set.ssl.issuercert?data->set.ssl.issuercert:"none");
return CURLE_SSL_ISSUER_ERROR;
}
infof(data,"\t server certificate issuer check OK (Issuer Cert: %s)\n",
data->set.ssl.issuercert?data->set.ssl.issuercert:"none");
}
size=sizeof(certbuf);
rc = gnutls_x509_crt_get_dn_by_oid(x509_cert, GNUTLS_OID_X520_COMMON_NAME,
0,
FALSE,
certbuf,
&size);
if(rc) {
infof(data, "error fetching CN from cert:%s\n",
gnutls_strerror(rc));
}
rc = gnutls_x509_crt_check_hostname(x509_cert, conn->host.name);
if(!rc) {
if(data->set.ssl.verifyhost > 1) {
failf(data, "SSL: certificate subject name (%s) does not match "
"target host name '%s'", certbuf, conn->host.dispname);
gnutls_x509_crt_deinit(x509_cert);
return CURLE_PEER_FAILED_VERIFICATION;
}
else
infof(data, "\t common name: %s (does not match '%s')\n",
certbuf, conn->host.dispname);
}
else
infof(data, "\t common name: %s (matched)\n", certbuf);
certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
if(certclock == (time_t)-1) {
failf(data, "server cert expiration date verify failed");
return CURLE_SSL_CONNECT_ERROR;
}
if(certclock < time(NULL)) {
if(data->set.ssl.verifypeer) {
failf(data, "server certificate expiration date has passed.");
return CURLE_PEER_FAILED_VERIFICATION;
}
else
infof(data, "\t server certificate expiration date FAILED\n");
}
else
infof(data, "\t server certificate expiration date OK\n");
certclock = gnutls_x509_crt_get_activation_time(x509_cert);
if(certclock == (time_t)-1) {
failf(data, "server cert activation date verify failed");
return CURLE_SSL_CONNECT_ERROR;
}
if(certclock > time(NULL)) {
if(data->set.ssl.verifypeer) {
failf(data, "server certificate not activated yet.");
return CURLE_PEER_FAILED_VERIFICATION;
}
else
infof(data, "\t server certificate activation date FAILED\n");
}
else
infof(data, "\t server certificate activation date OK\n");
algo = gnutls_x509_crt_get_pk_algorithm(x509_cert, &bits);
infof(data, "\t certificate public key: %s\n",
gnutls_pk_algorithm_get_name(algo));
infof(data, "\t certificate version: #%d\n",
gnutls_x509_crt_get_version(x509_cert));
size = sizeof(certbuf);
gnutls_x509_crt_get_dn(x509_cert, certbuf, &size);
infof(data, "\t subject: %s\n", certbuf);
certclock = gnutls_x509_crt_get_activation_time(x509_cert);
showtime(data, "start date", certclock);
certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
showtime(data, "expire date", certclock);
size = sizeof(certbuf);
gnutls_x509_crt_get_issuer_dn(x509_cert, certbuf, &size);
infof(data, "\t issuer: %s\n", certbuf);
gnutls_x509_crt_deinit(x509_cert);
ptr = gnutls_compression_get_name(gnutls_compression_get(session));
infof(data, "\t compression: %s\n", ptr);
ptr = gnutls_cipher_get_name(gnutls_cipher_get(session));
infof(data, "\t cipher: %s\n", ptr);
ptr = gnutls_mac_get_name(gnutls_mac_get(session));
infof(data, "\t MAC: %s\n", ptr);
conn->ssl[sockindex].state = ssl_connection_complete;
{
void *connect_sessionid;
size_t connect_idsize;
gnutls_session_get_data(session, NULL, &connect_idsize);
connect_sessionid = malloc(connect_idsize);
if(connect_sessionid) {
gnutls_session_get_data(session, connect_sessionid, &connect_idsize);
if(ssl_sessionid)
Curl_ssl_delsessionid(conn, ssl_sessionid);
return Curl_ssl_addsessionid(conn, connect_sessionid, connect_idsize);
}
}
return CURLE_OK;
}
ssize_t Curl_gtls_send(struct connectdata *conn,
int sockindex,
const void *mem,
size_t len)
{
ssize_t rc = gnutls_record_send(conn->ssl[sockindex].session, mem, len);
if(rc < 0 ) {
if(rc == GNUTLS_E_AGAIN)
return 0;
rc = -1;
}
return rc;
}
void Curl_gtls_close_all(struct SessionHandle *data)
{
(void)data;
}
static void close_one(struct connectdata *conn,
int idx)
{
if(conn->ssl[idx].session) {
gnutls_bye(conn->ssl[idx].session, GNUTLS_SHUT_RDWR);
gnutls_deinit(conn->ssl[idx].session);
conn->ssl[idx].session = NULL;
}
if(conn->ssl[idx].cred) {
gnutls_certificate_free_credentials(conn->ssl[idx].cred);
conn->ssl[idx].cred = NULL;
}
}
void Curl_gtls_close(struct connectdata *conn, int sockindex)
{
close_one(conn, sockindex);
}
int Curl_gtls_shutdown(struct connectdata *conn, int sockindex)
{
ssize_t result;
int retval = 0;
struct SessionHandle *data = conn->data;
int done = 0;
char buf[120];
if(data->set.ftp_ccc == CURLFTPSSL_CCC_ACTIVE)
gnutls_bye(conn->ssl[sockindex].session, GNUTLS_SHUT_WR);
if(conn->ssl[sockindex].session) {
while(!done) {
int what = Curl_socket_ready(conn->sock[sockindex],
CURL_SOCKET_BAD, SSL_SHUTDOWN_TIMEOUT);
if(what > 0) {
result = gnutls_record_recv(conn->ssl[sockindex].session,
buf, sizeof(buf));
switch(result) {
case 0:
done = 1;
break;
case GNUTLS_E_AGAIN:
case GNUTLS_E_INTERRUPTED:
infof(data, "GNUTLS_E_AGAIN || GNUTLS_E_INTERRUPTED\n");
break;
default:
retval = -1;
done = 1;
break;
}
}
else if(0 == what) {
failf(data, "SSL shutdown timeout");
done = 1;
break;
}
else {
failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
retval = -1;
done = 1;
}
}
gnutls_deinit(conn->ssl[sockindex].session);
}
gnutls_certificate_free_credentials(conn->ssl[sockindex].cred);
conn->ssl[sockindex].cred = NULL;
conn->ssl[sockindex].session = NULL;
return retval;
}
ssize_t Curl_gtls_recv(struct connectdata *conn,
int num,
char *buf,
size_t buffersize,
bool *wouldblock)
{
ssize_t ret;
ret = gnutls_record_recv(conn->ssl[num].session, buf, buffersize);
if((ret == GNUTLS_E_AGAIN) || (ret == GNUTLS_E_INTERRUPTED)) {
*wouldblock = TRUE;
return -1;
}
if(ret == GNUTLS_E_REHANDSHAKE) {
CURLcode rc = handshake(conn, conn->ssl[num].session, num, FALSE);
if(rc)
return rc;
*wouldblock = TRUE;
return -1;
}
*wouldblock = FALSE;
if(!ret) {
failf(conn->data, "Peer closed the TLS connection");
return -1;
}
if(ret < 0) {
failf(conn->data, "GnuTLS recv error (%d): %s",
(int)ret, gnutls_strerror((int)ret));
return -1;
}
return ret;
}
void Curl_gtls_session_free(void *ptr)
{
free(ptr);
}
size_t Curl_gtls_version(char *buffer, size_t size)
{
return snprintf(buffer, size, "GnuTLS/%s", gnutls_check_version(NULL));
}
int Curl_gtls_seed(struct SessionHandle *data)
{
static bool ssl_seeded = FALSE;
gcry_fast_random_poll();
if(!ssl_seeded || data->set.str[STRING_SSL_RANDOM_FILE] ||
data->set.str[STRING_SSL_EGDSOCKET]) {
ssl_seeded = TRUE;
}
return 0;
}
#endif