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nss: implement non-blocking SSL handshake

This commit is contained in:
Kamil Dudka 2014-04-25 17:36:51 +02:00
parent 3f180252f8
commit 0f6b1efb14
2 changed files with 534 additions and 1 deletions
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526
0003-curl-7.36.0-8868a226.patch Normal file
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@ -0,0 +1,526 @@
From 79dd8298f45b9f5dd97c06c397d40e45f905d5d3 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Thu, 17 Apr 2014 13:12:59 +0200
Subject: [PATCH 1/3] nss: split Curl_nss_connect() into 4 functions
[upstream commit a43bba3a34ed8912c4ca10f213590d1998ba0d29]
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
lib/vtls/nss.c | 134 +++++++++++++++++++++++++++++++++++++++-----------------
1 files changed, 94 insertions(+), 40 deletions(-)
diff --git a/lib/vtls/nss.c b/lib/vtls/nss.c
index 80e26e2..4f4e6c8 100644
--- a/lib/vtls/nss.c
+++ b/lib/vtls/nss.c
@@ -1296,9 +1296,62 @@ static CURLcode nss_init_sslver(SSLVersionRange *sslver,
return CURLE_SSL_CONNECT_ERROR;
}
-CURLcode Curl_nss_connect(struct connectdata *conn, int sockindex)
+static CURLcode nss_fail_connect(struct ssl_connect_data *connssl,
+ struct SessionHandle *data,
+ CURLcode curlerr)
{
+ SSLVersionRange sslver;
PRErrorCode err = 0;
+
+ /* reset the flag to avoid an infinite loop */
+ data->state.ssl_connect_retry = FALSE;
+
+ if(is_nss_error(curlerr)) {
+ /* read NSPR error code */
+ err = PR_GetError();
+ if(is_cc_error(err))
+ curlerr = CURLE_SSL_CERTPROBLEM;
+
+ /* print the error number and error string */
+ infof(data, "NSS error %d (%s)\n", err, nss_error_to_name(err));
+
+ /* print a human-readable message describing the error if available */
+ nss_print_error_message(data, err);
+ }
+
+ /* cleanup on connection failure */
+ Curl_llist_destroy(connssl->obj_list, NULL);
+ connssl->obj_list = NULL;
+
+ if((SSL_VersionRangeGet(connssl->handle, &sslver) == SECSuccess)
+ && (sslver.min == SSL_LIBRARY_VERSION_3_0)
+ && (sslver.max == SSL_LIBRARY_VERSION_TLS_1_0)
+ && isTLSIntoleranceError(err)) {
+ /* schedule reconnect through Curl_retry_request() */
+ data->state.ssl_connect_retry = TRUE;
+ infof(data, "Error in TLS handshake, trying SSLv3...\n");
+ return CURLE_OK;
+ }
+
+ return curlerr;
+}
+
+/* Switch the SSL socket into non-blocking mode. */
+static CURLcode nss_set_nonblock(struct ssl_connect_data *connssl,
+ struct SessionHandle *data)
+{
+ static PRSocketOptionData sock_opt;
+ sock_opt.option = PR_SockOpt_Nonblocking;
+ sock_opt.value.non_blocking = PR_TRUE;
+
+ if(PR_SetSocketOption(connssl->handle, &sock_opt) != PR_SUCCESS)
+ return nss_fail_connect(connssl, data, CURLE_SSL_CONNECT_ERROR);
+
+ return CURLE_OK;
+}
+
+static CURLcode nss_setup_connect(struct connectdata *conn, int sockindex)
+{
PRFileDesc *model = NULL;
PRBool ssl_no_cache;
PRBool ssl_cbc_random_iv;
@@ -1306,9 +1359,6 @@ CURLcode Curl_nss_connect(struct connectdata *conn, int sockindex)
curl_socket_t sockfd = conn->sock[sockindex];
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
CURLcode curlerr;
- PRSocketOptionData sock_opt;
- long time_left;
- PRUint32 timeout;
SSLVersionRange sslver = {
SSL_LIBRARY_VERSION_3_0, /* min */
@@ -1534,16 +1584,32 @@ CURLcode Curl_nss_connect(struct connectdata *conn, int sockindex)
SSL_SetURL(connssl->handle, conn->host.name);
+ return CURLE_OK;
+
+error:
+ if(model)
+ PR_Close(model);
+
+ return nss_fail_connect(connssl, data, curlerr);
+}
+
+static CURLcode nss_do_connect(struct connectdata *conn, int sockindex)
+{
+ struct ssl_connect_data *connssl = &conn->ssl[sockindex];
+ struct SessionHandle *data = conn->data;
+ CURLcode curlerr = CURLE_SSL_CONNECT_ERROR;
+ PRUint32 timeout;
+
/* check timeout situation */
- time_left = Curl_timeleft(data, NULL, TRUE);
+ const long time_left = Curl_timeleft(data, NULL, TRUE);
if(time_left < 0L) {
failf(data, "timed out before SSL handshake");
curlerr = CURLE_OPERATION_TIMEDOUT;
goto error;
}
- timeout = PR_MillisecondsToInterval((PRUint32) time_left);
/* Force the handshake now */
+ timeout = PR_MillisecondsToInterval((PRUint32) time_left);
if(SSL_ForceHandshakeWithTimeout(connssl->handle, timeout) != SECSuccess) {
if(conn->data->set.ssl.certverifyresult == SSL_ERROR_BAD_CERT_DOMAIN)
curlerr = CURLE_PEER_FAILED_VERIFICATION;
@@ -1552,12 +1618,6 @@ CURLcode Curl_nss_connect(struct connectdata *conn, int sockindex)
goto error;
}
- /* switch the SSL socket into non-blocking mode */
- sock_opt.option = PR_SockOpt_Nonblocking;
- sock_opt.value.non_blocking = PR_TRUE;
- if(PR_SetSocketOption(connssl->handle, &sock_opt) != PR_SUCCESS)
- goto error;
-
connssl->state = ssl_connection_complete;
conn->recv[sockindex] = nss_recv;
conn->send[sockindex] = nss_send;
@@ -1585,40 +1645,34 @@ CURLcode Curl_nss_connect(struct connectdata *conn, int sockindex)
return CURLE_OK;
- error:
- /* reset the flag to avoid an infinite loop */
- data->state.ssl_connect_retry = FALSE;
+error:
+ return nss_fail_connect(connssl, data, curlerr);
+}
- if(is_nss_error(curlerr)) {
- /* read NSPR error code */
- err = PR_GetError();
- if(is_cc_error(err))
- curlerr = CURLE_SSL_CERTPROBLEM;
+CURLcode Curl_nss_connect(struct connectdata *conn, int sockindex)
+{
+ struct ssl_connect_data *connssl = &conn->ssl[sockindex];
+ struct SessionHandle *data = conn->data;
+ CURLcode rv;
- /* print the error number and error string */
- infof(data, "NSS error %d (%s)\n", err, nss_error_to_name(err));
+ rv = nss_setup_connect(conn, sockindex);
+ if(rv)
+ return rv;
- /* print a human-readable message describing the error if available */
- nss_print_error_message(data, err);
+ rv = nss_do_connect(conn, sockindex);
+ switch(rv) {
+ case CURLE_OK:
+ break;
+ default:
+ return rv;
}
- if(model)
- PR_Close(model);
-
- /* cleanup on connection failure */
- Curl_llist_destroy(connssl->obj_list, NULL);
- connssl->obj_list = NULL;
-
- if((sslver.min == SSL_LIBRARY_VERSION_3_0)
- && (sslver.max == SSL_LIBRARY_VERSION_TLS_1_0)
- && isTLSIntoleranceError(err)) {
- /* schedule reconnect through Curl_retry_request() */
- data->state.ssl_connect_retry = TRUE;
- infof(data, "Error in TLS handshake, trying SSLv3...\n");
- return CURLE_OK;
- }
+ /* switch the SSL socket into non-blocking mode */
+ rv = nss_set_nonblock(connssl, data);
+ if(rv)
+ return rv;
- return curlerr;
+ return CURLE_OK;
}
static ssize_t nss_send(struct connectdata *conn, /* connection data */
--
1.7.1
From f6c04350401c111f92f1428f80a28b66f6609cac Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Thu, 17 Apr 2014 13:27:39 +0200
Subject: [PATCH 2/3] nss: implement non-blocking SSL handshake
[upstream commit 8868a226cdad66a9a07d6e3f168884817592a1df]
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
lib/urldata.h | 1 +
lib/vtls/nss.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++--------
lib/vtls/nssg.h | 1 +
3 files changed, 50 insertions(+), 9 deletions(-)
diff --git a/lib/urldata.h b/lib/urldata.h
index 25f9676..d3bb350 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -318,6 +318,7 @@ struct ssl_connect_data {
struct SessionHandle *data;
struct curl_llist *obj_list;
PK11GenericObject *obj_clicert;
+ ssl_connect_state connecting_state;
#endif /* USE_NSS */
#ifdef USE_QSOSSL
SSLHandle *handle;
diff --git a/lib/vtls/nss.c b/lib/vtls/nss.c
index 4f4e6c8..e076e54 100644
--- a/lib/vtls/nss.c
+++ b/lib/vtls/nss.c
@@ -1611,7 +1611,10 @@ static CURLcode nss_do_connect(struct connectdata *conn, int sockindex)
/* Force the handshake now */
timeout = PR_MillisecondsToInterval((PRUint32) time_left);
if(SSL_ForceHandshakeWithTimeout(connssl->handle, timeout) != SECSuccess) {
- if(conn->data->set.ssl.certverifyresult == SSL_ERROR_BAD_CERT_DOMAIN)
+ if(PR_GetError() == PR_WOULD_BLOCK_ERROR)
+ /* TODO: propagate the blocking direction from the NSPR layer */
+ return CURLE_AGAIN;
+ else if(conn->data->set.ssl.certverifyresult == SSL_ERROR_BAD_CERT_DOMAIN)
curlerr = CURLE_PEER_FAILED_VERIFICATION;
else if(conn->data->set.ssl.certverifyresult!=0)
curlerr = CURLE_SSL_CACERT;
@@ -1649,32 +1652,68 @@ error:
return nss_fail_connect(connssl, data, curlerr);
}
-CURLcode Curl_nss_connect(struct connectdata *conn, int sockindex)
+static CURLcode nss_connect_common(struct connectdata *conn, int sockindex,
+ bool *done)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct SessionHandle *data = conn->data;
+ const bool blocking = (done == NULL);
CURLcode rv;
- rv = nss_setup_connect(conn, sockindex);
- if(rv)
- return rv;
+ if(connssl->connecting_state == ssl_connect_1) {
+ rv = nss_setup_connect(conn, sockindex);
+ if(rv)
+ /* we do not expect CURLE_AGAIN from nss_setup_connect() */
+ return rv;
+
+ if(!blocking) {
+ /* in non-blocking mode, set NSS non-blocking mode before handshake */
+ rv = nss_set_nonblock(connssl, data);
+ if(rv)
+ return rv;
+ }
+
+ connssl->connecting_state = ssl_connect_2;
+ }
rv = nss_do_connect(conn, sockindex);
switch(rv) {
case CURLE_OK:
break;
+ case CURLE_AGAIN:
+ if(!blocking)
+ /* CURLE_AGAIN in non-blocking mode is not an error */
+ return CURLE_OK;
+ /* fall through */
default:
return rv;
}
- /* switch the SSL socket into non-blocking mode */
- rv = nss_set_nonblock(connssl, data);
- if(rv)
- return rv;
+ if(blocking) {
+ /* in blocking mode, set NSS non-blocking mode _after_ SSL handshake */
+ rv = nss_set_nonblock(connssl, data);
+ if(rv)
+ return rv;
+ }
+ else
+ /* signal completed SSL handshake */
+ *done = TRUE;
+ connssl->connecting_state = ssl_connect_done;
return CURLE_OK;
}
+CURLcode Curl_nss_connect(struct connectdata *conn, int sockindex)
+{
+ return nss_connect_common(conn, sockindex, /* blocking */ NULL);
+}
+
+CURLcode Curl_nss_connect_nonblocking(struct connectdata *conn,
+ int sockindex, bool *done)
+{
+ return nss_connect_common(conn, sockindex, done);
+}
+
static ssize_t nss_send(struct connectdata *conn, /* connection data */
int sockindex, /* socketindex */
const void *mem, /* send this data */
diff --git a/lib/vtls/nssg.h b/lib/vtls/nssg.h
index 38181a9..21e96ce 100644
--- a/lib/vtls/nssg.h
+++ b/lib/vtls/nssg.h
@@ -68,6 +68,7 @@ void Curl_nss_md5sum(unsigned char *tmp, /* input */
#define curlssl_init Curl_nss_init
#define curlssl_cleanup Curl_nss_cleanup
#define curlssl_connect Curl_nss_connect
+#define curlssl_connect_nonblocking Curl_nss_connect_nonblocking
/* NSS has its own session ID cache */
#define curlssl_session_free(x) Curl_nop_stmt
--
1.7.1
From 9fb78efb737ea8c2a9f7c27ea501b1fcf6a90599 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Wed, 23 Apr 2014 15:37:26 +0200
Subject: [PATCH 3/3] nss: propagate blocking direction from NSPR I/O
... during the non-blocking SSL handshake
[upstream commit 9c941e92c4bd3d2a5dbe243f7517b6a6029afc6e]
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
lib/http.c | 2 +-
lib/vtls/nss.c | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++++---
2 files changed, 104 insertions(+), 6 deletions(-)
diff --git a/lib/http.c b/lib/http.c
index 4a29058..3f8a4c0 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -1361,7 +1361,7 @@ static CURLcode https_connecting(struct connectdata *conn, bool *done)
#endif
#if defined(USE_SSLEAY) || defined(USE_GNUTLS) || defined(USE_SCHANNEL) || \
- defined(USE_DARWINSSL) || defined(USE_POLARSSL)
+ defined(USE_DARWINSSL) || defined(USE_POLARSSL) || defined(USE_NSS)
/* This function is for OpenSSL, GnuTLS, darwinssl, schannel and polarssl only.
It should be made to query the generic SSL layer instead. */
static int https_getsock(struct connectdata *conn,
diff --git a/lib/vtls/nss.c b/lib/vtls/nss.c
index e076e54..3447f97 100644
--- a/lib/vtls/nss.c
+++ b/lib/vtls/nss.c
@@ -180,6 +180,10 @@ static const cipher_s cipherlist[] = {
static const char* pem_library = "libnsspem.so";
SECMODModule* mod = NULL;
+/* NSPR I/O layer we use to detect blocking direction during SSL handshake */
+static PRDescIdentity nspr_io_identity = PR_INVALID_IO_LAYER;
+static PRIOMethods nspr_io_methods;
+
static const char* nss_error_to_name(PRErrorCode code)
{
const char *name = PR_ErrorToName(code);
@@ -940,6 +944,60 @@ isTLSIntoleranceError(PRInt32 err)
}
}
+/* update blocking direction in case of PR_WOULD_BLOCK_ERROR */
+static void nss_update_connecting_state(ssl_connect_state state, void *secret)
+{
+ struct ssl_connect_data *connssl = (struct ssl_connect_data *)secret;
+ if(PR_GetError() != PR_WOULD_BLOCK_ERROR)
+ /* an unrelated error is passing by */
+ return;
+
+ switch(connssl->connecting_state) {
+ case ssl_connect_2:
+ case ssl_connect_2_reading:
+ case ssl_connect_2_writing:
+ break;
+ default:
+ /* we are not called from an SSL handshake */
+ return;
+ }
+
+ /* update the state accordingly */
+ connssl->connecting_state = state;
+}
+
+/* recv() wrapper we use to detect blocking direction during SSL handshake */
+static PRInt32 nspr_io_recv(PRFileDesc *fd, void *buf, PRInt32 amount,
+ PRIntn flags, PRIntervalTime timeout)
+{
+ const PRRecvFN recv_fn = fd->lower->methods->recv;
+ const PRInt32 rv = recv_fn(fd->lower, buf, amount, flags, timeout);
+ if(rv < 0)
+ /* check for PR_WOULD_BLOCK_ERROR and update blocking direction */
+ nss_update_connecting_state(ssl_connect_2_reading, fd->secret);
+ return rv;
+}
+
+/* send() wrapper we use to detect blocking direction during SSL handshake */
+static PRInt32 nspr_io_send(PRFileDesc *fd, const void *buf, PRInt32 amount,
+ PRIntn flags, PRIntervalTime timeout)
+{
+ const PRSendFN send_fn = fd->lower->methods->send;
+ const PRInt32 rv = send_fn(fd->lower, buf, amount, flags, timeout);
+ if(rv < 0)
+ /* check for PR_WOULD_BLOCK_ERROR and update blocking direction */
+ nss_update_connecting_state(ssl_connect_2_writing, fd->secret);
+ return rv;
+}
+
+/* close() wrapper to avoid assertion failure due to fd->secret != NULL */
+static PRStatus nspr_io_close(PRFileDesc *fd)
+{
+ const PRCloseFN close_fn = PR_GetDefaultIOMethods()->close;
+ fd->secret = NULL;
+ return close_fn(fd);
+}
+
static CURLcode nss_init_core(struct SessionHandle *data, const char *cert_dir)
{
NSSInitParameters initparams;
@@ -1004,6 +1062,21 @@ static CURLcode nss_init(struct SessionHandle *data)
}
}
+ if(nspr_io_identity == PR_INVALID_IO_LAYER) {
+ /* allocate an identity for our own NSPR I/O layer */
+ nspr_io_identity = PR_GetUniqueIdentity("libcurl");
+ if(nspr_io_identity == PR_INVALID_IO_LAYER)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* the default methods just call down to the lower I/O layer */
+ memcpy(&nspr_io_methods, PR_GetDefaultIOMethods(), sizeof nspr_io_methods);
+
+ /* override certain methods in the table by our wrappers */
+ nspr_io_methods.recv = nspr_io_recv;
+ nspr_io_methods.send = nspr_io_send;
+ nspr_io_methods.close = nspr_io_close;
+ }
+
rv = nss_init_core(data, cert_dir);
if(rv)
return rv;
@@ -1353,6 +1426,8 @@ static CURLcode nss_set_nonblock(struct ssl_connect_data *connssl,
static CURLcode nss_setup_connect(struct connectdata *conn, int sockindex)
{
PRFileDesc *model = NULL;
+ PRFileDesc *nspr_io = NULL;
+ PRFileDesc *nspr_io_stub = NULL;
PRBool ssl_no_cache;
PRBool ssl_cbc_random_iv;
struct SessionHandle *data = conn->data;
@@ -1525,11 +1600,34 @@ static CURLcode nss_setup_connect(struct connectdata *conn, int sockindex)
goto error;
}
- /* Import our model socket onto the existing file descriptor */
- connssl->handle = PR_ImportTCPSocket(sockfd);
- connssl->handle = SSL_ImportFD(model, connssl->handle);
- if(!connssl->handle)
+ /* wrap OS file descriptor by NSPR's file descriptor abstraction */
+ nspr_io = PR_ImportTCPSocket(sockfd);
+ if(!nspr_io)
+ goto error;
+
+ /* create our own NSPR I/O layer */
+ nspr_io_stub = PR_CreateIOLayerStub(nspr_io_identity, &nspr_io_methods);
+ if(!nspr_io_stub) {
+ PR_Close(nspr_io);
+ goto error;
+ }
+
+ /* make the per-connection data accessible from NSPR I/O callbacks */
+ nspr_io_stub->secret = (void *)connssl;
+
+ /* push our new layer to the NSPR I/O stack */
+ if(PR_PushIOLayer(nspr_io, PR_TOP_IO_LAYER, nspr_io_stub) != PR_SUCCESS) {
+ PR_Close(nspr_io);
+ PR_Close(nspr_io_stub);
goto error;
+ }
+
+ /* import our model socket onto the current I/O stack */
+ connssl->handle = SSL_ImportFD(model, nspr_io);
+ if(!connssl->handle) {
+ PR_Close(nspr_io);
+ goto error;
+ }
PR_Close(model); /* We don't need this any more */
model = NULL;
@@ -1612,7 +1710,7 @@ static CURLcode nss_do_connect(struct connectdata *conn, int sockindex)
timeout = PR_MillisecondsToInterval((PRUint32) time_left);
if(SSL_ForceHandshakeWithTimeout(connssl->handle, timeout) != SECSuccess) {
if(PR_GetError() == PR_WOULD_BLOCK_ERROR)
- /* TODO: propagate the blocking direction from the NSPR layer */
+ /* blocking direction is updated by nss_update_connecting_state() */
return CURLE_AGAIN;
else if(conn->data->set.ssl.certverifyresult == SSL_ERROR_BAD_CERT_DOMAIN)
curlerr = CURLE_PEER_FAILED_VERIFICATION;
--
1.7.1

9
curl.spec
View File

@ -1,7 +1,7 @@
Summary: A utility for getting files from remote servers (FTP, HTTP, and others)
Name: curl
Version: 7.36.0
Release: 2%{?dist}
Release: 3%{?dist}
License: MIT
Group: Applications/Internet
Source: http://curl.haxx.se/download/%{name}-%{version}.tar.lzma
@ -13,6 +13,9 @@ Patch1: 0001-curl-7.36.0-f82e0edc.patch
# extend URL parser to support IPv6 zone identifiers (#680996)
Patch2: 0002-curl-7.36.0-9317eced.patch
# nss: implement non-blocking SSL handshake
Patch3: 0003-curl-7.36.0-8868a226.patch
# patch making libcurl multilib ready
Patch101: 0101-curl-7.32.0-multilib.patch
@ -127,6 +130,7 @@ documentation of the library, too.
# upstream patches
%patch1 -p1
%patch2 -p1
%patch3 -p1
# Fedora patches
%patch101 -p1
@ -248,6 +252,9 @@ rm -rf $RPM_BUILD_ROOT
%{_datadir}/aclocal/libcurl.m4
%changelog
* Fri Apr 25 2014 Kamil Dudka <kdudka@redhat.com> 7.36.0-3
- nss: implement non-blocking SSL handshake
* Wed Apr 02 2014 Kamil Dudka <kdudka@redhat.com> 7.36.0-2
- extend URL parser to support IPv6 zone identifiers (#680996)