/* ====================================================== */
CURLcode
Curl_SSLConnect(struct connectdata *conn,
int sockindex)
{
CURLcode retcode = CURLE_OK;
#ifdef USE_SSLEAY
struct SessionHandle *data = conn->data;
int err;
long lerr;
int what;
char * str;
SSL_METHOD *req_method;
SSL_SESSION *ssl_sessionid=NULL;
ASN1_TIME *certdate;
curl_socket_t sockfd = conn->sock[sockindex];
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
/* mark this is being ssl enabled from here on out. */
connssl->use = TRUE;
if(!ssl_seeded || data->set.ssl.random_file || data->set.ssl.egdsocket) {
/* Make funny stuff to get random input */
random_the_seed(data);
ssl_seeded = TRUE;
}
/* check to see if we've been told to use an explicit SSL/TLS version */
switch(data->set.ssl.version) {
default:
case CURL_SSLVERSION_DEFAULT:
/* we try to figure out version */
req_method = SSLv23_client_method();
break;
case CURL_SSLVERSION_TLSv1:
req_method = TLSv1_client_method();
break;
case CURL_SSLVERSION_SSLv2:
req_method = SSLv2_client_method();
break;
case CURL_SSLVERSION_SSLv3:
req_method = SSLv3_client_method();
break;
}
connssl->ctx = SSL_CTX_new(req_method);
if(!connssl->ctx) {
failf(data, "SSL: couldn't create a context!");
return CURLE_OUT_OF_MEMORY;
}
#ifdef SSL_CTRL_SET_MSG_CALLBACK
if (data->set.fdebug) {
SSL_CTX_callback_ctrl(connssl->ctx, SSL_CTRL_SET_MSG_CALLBACK,
ssl_tls_trace);
SSL_CTX_ctrl(connssl->ctx, SSL_CTRL_SET_MSG_CALLBACK_ARG, 0, conn);
}
#endif
/* OpenSSL contains code to work-around lots of bugs and flaws in various
SSL-implementations. SSL_CTX_set_options() is used to enabled those
work-arounds. The man page for this option states that SSL_OP_ALL enables
ll the work-arounds and that "It is usually safe to use SSL_OP_ALL to
enable the bug workaround options if compatibility with somewhat broken
implementations is desired."
*/
SSL_CTX_set_options(connssl->ctx, SSL_OP_ALL);
#if 0
/*
* Not sure it's needed to tell SSL_connect() that socket is
* non-blocking. It doesn't seem to care, but just return with
* SSL_ERROR_WANT_x.
*/
if (data->state.used_interface == Curl_if_multi)
SSL_CTX_ctrl(connssl->ctx, BIO_C_SET_NBIO, 1, NULL);
#endif
if(data->set.cert) {
if(!cert_stuff(conn,
connssl->ctx,
data->set.cert,
data->set.cert_type,
data->set.key,
data->set.key_type)) {
/* failf() is already done in cert_stuff() */
return CURLE_SSL_CERTPROBLEM;
}
}
if(data->set.ssl.cipher_list) {
if(!SSL_CTX_set_cipher_list(connssl->ctx,
data->set.ssl.cipher_list)) {
failf(data, "failed setting cipher list");
return CURLE_SSL_CIPHER;
}
}
if (data->set.ssl.CAfile || data->set.ssl.CApath) {
/* tell SSL where to find CA certificates that are used to verify
the servers certificate. */
if (!SSL_CTX_load_verify_locations(connssl->ctx, data->set.ssl.CAfile,
data->set.ssl.CApath)) {
if (data->set.ssl.verifypeer) {
/* Fail if we insist on successfully verifying the server. */
failf(data,"error setting certificate verify locations:\n"
" CAfile: %s\n CApath: %s\n",
data->set.ssl.CAfile ? data->set.ssl.CAfile : "none",
data->set.ssl.CApath ? data->set.ssl.CApath : "none");
return CURLE_SSL_CACERT;
}
else {
/* Just continue with a warning if no strict certificate verification
is required. */
infof(data, "error setting certificate verify locations,"
" continuing anyway:\n");
}
}
else {
/* Everything is fine. */
infof(data, "successfully set certificate verify locations:\n");
}
infof(data,
" CAfile: %s\n"
" CApath: %s\n",
data->set.ssl.CAfile ? data->set.ssl.CAfile : "none",
data->set.ssl.CApath ? data->set.ssl.CApath : "none");
}
/* SSL always tries to verify the peer, this only says whether it should
* fail to connect if the verification fails, or if it should continue
* anyway. In the latter case the result of the verification is checked with
* SSL_get_verify_result() below. */
SSL_CTX_set_verify(connssl->ctx,
data->set.ssl.verifypeer?SSL_VERIFY_PEER:SSL_VERIFY_NONE,
cert_verify_callback);
/* give application a chance to interfere with SSL set up. */
if(data->set.ssl.fsslctx) {
retcode = (*data->set.ssl.fsslctx)(data, connssl->ctx,
data->set.ssl.fsslctxp);
if(retcode) {
failf(data,"error signaled by ssl ctx callback");
return retcode;
}
}
/* Lets make an SSL structure */
connssl->handle = SSL_new(connssl->ctx);
SSL_set_connect_state(connssl->handle);
connssl->server_cert = 0x0;
if(!conn->bits.reuse) {
/* We're not re-using a connection, check if there's a cached ID we
can/should use here! */
if(!Get_SSL_Session(conn, &ssl_sessionid)) {
/* we got a session id, use it! */
SSL_set_session(connssl->handle, ssl_sessionid);
/* Informational message */
infof (data, "SSL re-using session ID\n");
}
}
/* pass the raw socket into the SSL layers */
SSL_set_fd(connssl->handle, sockfd);
while(1) {
fd_set writefd;
fd_set readfd;
struct timeval interval;
long timeout_ms;
/* Find out if any timeout is set. If not, use 300 seconds.
Otherwise, figure out the most strict timeout of the two possible one
and then how much time that has elapsed to know how much time we
allow for the connect call */
if(data->set.timeout || data->set.connecttimeout) {
long has_passed;
/* Evaluate in milliseconds how much time that has passed */
has_passed = Curl_tvdiff(Curl_tvnow(), data->progress.start);
/* get the most strict timeout of the ones converted to milliseconds */
if(data->set.timeout &&
(data->set.timeout>data->set.connecttimeout))
timeout_ms = data->set.timeout*1000;
else
timeout_ms = data->set.connecttimeout*1000;
/* subtract the passed time */
timeout_ms -= has_passed;
if(timeout_ms < 0) {
/* a precaution, no need to continue if time already is up */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEOUTED;
}
}
else
/* no particular time-out has been set */
timeout_ms= DEFAULT_CONNECT_TIMEOUT;
FD_ZERO(&writefd);
FD_ZERO(&readfd);
err = SSL_connect(connssl->handle);
/* 1 is fine
0 is "not successful but was shut down controlled"
<0 is "handshake was not successful, because a fatal error occurred" */
if(1 != err) {
int detail = SSL_get_error(connssl->handle, err);
if(SSL_ERROR_WANT_READ == detail)
FD_SET(sockfd, &readfd);
else if(SSL_ERROR_WANT_WRITE == detail)
FD_SET(sockfd, &writefd);
else {
/* untreated error */
unsigned long errdetail;
char error_buffer[120]; /* OpenSSL documents that this must be at least
120 bytes long. */
CURLcode rc;
const char *cert_problem = NULL;
errdetail = ERR_get_error(); /* Gets the earliest error code from the
thread's error queue and removes the
entry. */
switch(errdetail) {
case 0x1407E086:
/* 1407E086:
SSL routines:
SSL2_SET_CERTIFICATE:
certificate verify failed */
/* fall-through */
case 0x14090086:
/* 14090086:
SSL routines:
SSL3_GET_SERVER_CERTIFICATE:
certificate verify failed */
cert_problem = "SSL certificate problem, verify that the CA cert is"
" OK. Details:\n";
rc = CURLE_SSL_CACERT;
break;
default:
rc = CURLE_SSL_CONNECT_ERROR;
break;
}
/* detail is already set to the SSL error above */
/* If we e.g. use SSLv2 request-method and the server doesn't like us
* (RST connection etc.), OpenSSL gives no explanation whatsoever and
* the SO_ERROR is also lost.
*/
if (CURLE_SSL_CONNECT_ERROR == rc && errdetail == 0) {
failf(data, "Unknown SSL protocol error in connection to %s:%d ",
conn->host.name, conn->port);
return rc;
}
/* Could be a CERT problem */
#ifdef HAVE_ERR_ERROR_STRING_N
/* OpenSSL 0.9.6 and later has a function named
ERRO_error_string_n() that takes the size of the buffer as a
third argument */
ERR_error_string_n(errdetail, error_buffer, sizeof(error_buffer));
#else
ERR_error_string(errdetail, error_buffer);
#endif
failf(data, "%s%s", cert_problem ? cert_problem : "", error_buffer);
return rc;
}
}
else
/* we have been connected fine, get out of the connect loop */
break;
interval.tv_sec = (int)(timeout_ms/1000);
timeout_ms -= interval.tv_sec*1000;
interval.tv_usec = timeout_ms*1000;
while(1) {
what = select(sockfd+1, &readfd, &writefd, NULL, &interval);
if(what > 0)
/* reabable or writable, go loop in the outer loop */
break;
else if(0 == what) {
/* timeout */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
else {
#if !defined(WIN32) && defined(EINTR)
/* For platforms without EINTR all errnos are bad */
if (errno == EINTR)
continue; /* retry the select() */
#endif
/* anything other than the unimportant EINTR is fatally bad */
failf(data, "select on SSL socket, errno: %d", Curl_ourerrno());
return CURLE_SSL_CONNECT_ERROR;
}
} /* while()-loop for the select() */
} /* while()-loop for the SSL_connect() */
/* Informational message */
infof (data, "SSL connection using %s\n",
SSL_get_cipher(connssl->handle));
if(!ssl_sessionid) {
/* Since this is not a cached session ID, then we want to stach this one
in the cache! */
Store_SSL_Session(conn, connssl);
}
/* Get server's certificate (note: beware of dynamic allocation) - opt */
/* major serious hack alert -- we should check certificates
* to authenticate the server; otherwise we risk man-in-the-middle
* attack
*/
connssl->server_cert = SSL_get_peer_certificate(connssl->handle);
if(!connssl->server_cert) {
failf(data, "SSL: couldn't get peer certificate!");
return CURLE_SSL_PEER_CERTIFICATE;
}
infof (data, "Server certificate:\n");
str = X509_NAME_oneline(X509_get_subject_name(connssl->server_cert),
NULL, 0);
if(!str) {
failf(data, "SSL: couldn't get X509-subject!");
X509_free(connssl->server_cert);
return CURLE_SSL_CONNECT_ERROR;
}
infof(data, "\t subject: %s\n", str);
CRYPTO_free(str);
certdate = X509_get_notBefore(connssl->server_cert);
Curl_ASN1_UTCTIME_output(conn, "\t start date: ", certdate);
certdate = X509_get_notAfter(connssl->server_cert);
Curl_ASN1_UTCTIME_output(conn, "\t expire date: ", certdate);
if(data->set.ssl.verifyhost) {
retcode = verifyhost(conn, connssl->server_cert);
if(retcode) {
X509_free(connssl->server_cert);
return retcode;
}
}
str = X509_NAME_oneline(X509_get_issuer_name(connssl->server_cert),
NULL, 0);
if(!str) {
failf(data, "SSL: couldn't get X509-issuer name!");
retcode = CURLE_SSL_CONNECT_ERROR;
}
else {
infof(data, "\t issuer: %s\n", str);
CRYPTO_free(str);
/* We could do all sorts of certificate verification stuff here before
deallocating the certificate. */
lerr = data->set.ssl.certverifyresult=
SSL_get_verify_result(connssl->handle);
if(data->set.ssl.certverifyresult != X509_V_OK) {
if(data->set.ssl.verifypeer) {
/* We probably never reach this, because SSL_connect() will fail
and we return earlyer if verifypeer is set? */
failf(data, "SSL certificate verify result: %s (%ld)",
X509_verify_cert_error_string(lerr), lerr);
retcode = CURLE_SSL_PEER_CERTIFICATE;
}
else
infof(data, "SSL certificate verify result: %s (%ld),"
" continuing anyway.\n",
X509_verify_cert_error_string(err), lerr);
}
else
infof(data, "SSL certificate verify ok.\n");
}
X509_free(connssl->server_cert);
#else /* USE_SSLEAY */
(void)conn;
(void)sockindex;
#endif
return retcode;
}
/* ====================================================== */
CURLcode
Curl_SSLConnect(struct connectdata *conn)
{
CURLcode retcode = CURLE_OK;
#ifdef USE_SSLEAY
struct SessionHandle *data = conn->data;
int err;
char * str;
SSL_METHOD *req_method;
SSL_SESSION *ssl_sessionid=NULL;
ASN1_TIME *certdate;
/* mark this is being ssl enabled from here on out. */
conn->ssl.use = TRUE;
if(!ssl_seeded || data->set.ssl.random_file || data->set.ssl.egdsocket) {
/* Make funny stuff to get random input */
random_the_seed(data);
ssl_seeded = TRUE;
}
/* check to see if we've been told to use an explicit SSL/TLS version */
switch(data->set.ssl.version) {
default:
case CURL_SSLVERSION_DEFAULT:
/* we try to figure out version */
req_method = SSLv23_client_method();
break;
case CURL_SSLVERSION_TLSv1:
req_method = TLSv1_client_method();
break;
case CURL_SSLVERSION_SSLv2:
req_method = SSLv2_client_method();
break;
case CURL_SSLVERSION_SSLv3:
req_method = SSLv3_client_method();
break;
}
conn->ssl.ctx = SSL_CTX_new(req_method);
if(!conn->ssl.ctx) {
failf(data, "SSL: couldn't create a context!");
return CURLE_OUT_OF_MEMORY;
}
if(data->set.cert) {
if (!cert_stuff(conn,
data->set.cert,
data->set.cert_type,
data->set.key,
data->set.key_type)) {
/* failf() is already done in cert_stuff() */
return CURLE_SSL_CONNECT_ERROR;
}
}
if(data->set.ssl.cipher_list) {
if (!SSL_CTX_set_cipher_list(conn->ssl.ctx,
data->set.ssl.cipher_list)) {
failf(data, "failed setting cipher list");
return CURLE_SSL_CONNECT_ERROR;
}
}
if(data->set.ssl.verifypeer){
SSL_CTX_set_verify(conn->ssl.ctx,
SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT|
SSL_VERIFY_CLIENT_ONCE,
cert_verify_callback);
if (!SSL_CTX_load_verify_locations(conn->ssl.ctx,
data->set.ssl.CAfile,
data->set.ssl.CApath)) {
failf(data,"error setting cerficate verify locations");
return CURLE_SSL_CONNECT_ERROR;
}
}
else
SSL_CTX_set_verify(conn->ssl.ctx, SSL_VERIFY_NONE, cert_verify_callback);
/* Lets make an SSL structure */
conn->ssl.handle = SSL_new (conn->ssl.ctx);
SSL_set_connect_state (conn->ssl.handle);
conn->ssl.server_cert = 0x0;
if(!conn->bits.reuse) {
/* We're not re-using a connection, check if there's a cached ID we
can/should use here! */
if(!Get_SSL_Session(conn, &ssl_sessionid)) {
/* we got a session id, use it! */
SSL_set_session(conn->ssl.handle, ssl_sessionid);
/* Informational message */
infof (data, "SSL re-using session ID\n");
}
}
/* pass the raw socket into the SSL layers */
SSL_set_fd(conn->ssl.handle, conn->firstsocket);
do {
int what;
fd_set writefd;
fd_set readfd;
struct timeval interval;
long timeout_ms;
err = SSL_connect(conn->ssl.handle);
what = SSL_get_error(conn->ssl.handle, err);
FD_ZERO(&writefd);
FD_ZERO(&readfd);
if(SSL_ERROR_WANT_READ == what)
FD_SET(conn->firstsocket, &readfd);
else if(SSL_ERROR_WANT_WRITE == what)
FD_SET(conn->firstsocket, &writefd);
else
break; /* untreated error */
/* Find out if any timeout is set. If not, use 300 seconds.
Otherwise, figure out the most strict timeout of the two possible one
and then how much time that has elapsed to know how much time we
allow for the connect call */
if(data->set.timeout || data->set.connecttimeout) {
double has_passed;
/* Evaluate in milliseconds how much time that has passed */
has_passed = Curl_tvdiff(Curl_tvnow(), data->progress.start);
#ifndef min
#define min(a, b) ((a) < (b) ? (a) : (b))
#endif
/* get the most strict timeout of the ones converted to milliseconds */
if(data->set.timeout &&
(data->set.timeout>data->set.connecttimeout))
timeout_ms = data->set.timeout*1000;
else
timeout_ms = data->set.connecttimeout*1000;
/* subtract the passed time */
timeout_ms -= (long)has_passed;
if(timeout_ms < 0) {
/* a precaution, no need to continue if time already is up */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEOUTED;
}
}
else
/* no particular time-out has been set */
timeout_ms=300000; /* milliseconds, default to five minutes */
interval.tv_sec = timeout_ms/1000;
timeout_ms -= interval.tv_sec*1000;
interval.tv_usec = timeout_ms*1000;
what = select(conn->firstsocket+1, &readfd, &writefd, NULL, &interval);
if(what > 0)
/* reabable or writable, go loop yourself */
continue;
else if(0 == what) {
/* timeout */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEOUTED;
}
else
break; /* get out of loop */
} while(1);
/* 1 is fine
0 is "not successful but was shut down controlled"
<0 is "handshake was not successful, because a fatal error occurred" */
if (err <= 0) {
err = ERR_get_error();
failf(data, "SSL: %s", ERR_error_string(err, NULL));
return CURLE_SSL_CONNECT_ERROR;
}
/* Informational message */
infof (data, "SSL connection using %s\n",
SSL_get_cipher(conn->ssl.handle));
if(!ssl_sessionid) {
/* Since this is not a cached session ID, then we want to stach this one
in the cache! */
Store_SSL_Session(conn);
}
/* Get server's certificate (note: beware of dynamic allocation) - opt */
/* major serious hack alert -- we should check certificates
* to authenticate the server; otherwise we risk man-in-the-middle
* attack
*/
conn->ssl.server_cert = SSL_get_peer_certificate (conn->ssl.handle);
if(!conn->ssl.server_cert) {
failf(data, "SSL: couldn't get peer certificate!");
return CURLE_SSL_PEER_CERTIFICATE;
}
infof (data, "Server certificate:\n");
str = X509_NAME_oneline (X509_get_subject_name (conn->ssl.server_cert),
NULL, 0);
if(!str) {
failf(data, "SSL: couldn't get X509-subject!");
X509_free(conn->ssl.server_cert);
return CURLE_SSL_CONNECT_ERROR;
}
infof(data, "\t subject: %s\n", str);
CRYPTO_free(str);
certdate = X509_get_notBefore(conn->ssl.server_cert);
Curl_ASN1_UTCTIME_output(conn, "\t start date: ", certdate);
certdate = X509_get_notAfter(conn->ssl.server_cert);
Curl_ASN1_UTCTIME_output(conn, "\t expire date: ", certdate);
if (data->set.ssl.verifyhost) {
char peer_CN[257];
if (X509_NAME_get_text_by_NID(X509_get_subject_name(conn->ssl.server_cert),
NID_commonName,
peer_CN,
sizeof(peer_CN)) < 0) {
failf(data, "SSL: unable to obtain common name from peer certificate");
X509_free(conn->ssl.server_cert);
return CURLE_SSL_PEER_CERTIFICATE;
}
if (!strequal(peer_CN, conn->hostname)) {
if (data->set.ssl.verifyhost > 1) {
failf(data, "SSL: certificate subject name '%s' does not match "
"target host name '%s'",
peer_CN, conn->hostname);
X509_free(conn->ssl.server_cert);
return CURLE_SSL_PEER_CERTIFICATE;
}
else
infof(data,
"\t common name: %s (does not match '%s')\n",
peer_CN, conn->hostname);
}
else
infof(data, "\t common name: %s (matched)\n", peer_CN);
}
str = X509_NAME_oneline (X509_get_issuer_name (conn->ssl.server_cert),
NULL, 0);
if(!str) {
failf(data, "SSL: couldn't get X509-issuer name!");
X509_free(conn->ssl.server_cert);
return CURLE_SSL_CONNECT_ERROR;
}
infof(data, "\t issuer: %s\n", str);
CRYPTO_free(str);
/* We could do all sorts of certificate verification stuff here before
deallocating the certificate. */
if(data->set.ssl.verifypeer) {
data->set.ssl.certverifyresult=SSL_get_verify_result(conn->ssl.handle);
if (data->set.ssl.certverifyresult != X509_V_OK) {
failf(data, "SSL certificate verify result: %d",
data->set.ssl.certverifyresult);
retcode = CURLE_SSL_PEER_CERTIFICATE;
}
}
else
data->set.ssl.certverifyresult=0;
X509_free(conn->ssl.server_cert);
#else /* USE_SSLEAY */
/* this is for "-ansi -Wall -pedantic" to stop complaining! (rabe) */
(void) conn;
#endif
return retcode;
}
