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vlib.http: fix http schannel & follow redirects & cleanup

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joe-conigliaro 2019-08-10 18:05:59 +10:00 committed by Alexander Medvednikov
parent 2ebfc8ab73
commit a0b59783a2
5 changed files with 164 additions and 117 deletions
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250
thirdparty/vschannel/vschannel.c vendored
View File

@ -24,6 +24,26 @@ HMODULE g_hsecurity = NULL;
// SSPI
PSecurityFunctionTable sspi;
struct TlsContext tls_ctx;
struct TlsContext {
SOCKET Socket;
WSADATA WsaData;
CredHandle hClientCreds;
CtxtHandle hContext;
BOOL fCredsInitialized;
BOOL fContextInitialized;
PCCERT_CONTEXT pRemoteCertContext;
};
struct TlsContext new_tls_context() {
return (struct TlsContext) {
.Socket = INVALID_SOCKET,
.fCredsInitialized = FALSE,
.fContextInitialized = FALSE,
.pRemoteCertContext = NULL
};
};
BOOL load_security_library(void) {
INIT_SECURITY_INTERFACE pInitSecurityInterface;
@ -58,133 +78,28 @@ void unload_security_library(void) {
g_hsecurity = NULL;
}
INT request(CHAR *host, CHAR *req, CHAR *out)
{
WSADATA WsaData;
SOCKET Socket = INVALID_SOCKET;
CredHandle hClientCreds;
CtxtHandle hContext;
BOOL fCredsInitialized = FALSE;
BOOL fContextInitialized = FALSE;
SecBuffer ExtraData;
SECURITY_STATUS Status;
PCCERT_CONTEXT pRemoteCertContext = NULL;
INT i;
INT iOption;
PCHAR pszOption;
INT resp_length = 0;
// protocol = SP_PROT_PCT1;
// protocol = SP_PROT_SSL2;
// protocol = SP_PROT_SSL3;
protocol = SP_PROT_TLS1_2_CLIENT;
if(!load_security_library()) {
printf("Error initializing the security library\n");
goto cleanup;
}
// Initialize the WinSock subsystem.
if(WSAStartup(0x0101, &WsaData) == SOCKET_ERROR) {
printf("Error %d returned by WSAStartup\n", GetLastError());
goto cleanup;
}
// Create credentials.
if(create_credentials(&hClientCreds)) {
printf("Error creating credentials\n");
goto cleanup;
}
fCredsInitialized = TRUE;
// Connect to server.
if(connect_to_server(host, port_number, &Socket)) {
printf("Error connecting to server\n");
goto cleanup;
}
// Perform handshake
if(perform_client_handshake(Socket, &hClientCreds, host, &hContext, &ExtraData)) {
printf("Error performing handshake\n");
goto cleanup;
}
fContextInitialized = TRUE;
// Authenticate server's credentials.
// Get server's certificate.
Status = sspi->QueryContextAttributes(&hContext,
SECPKG_ATTR_REMOTE_CERT_CONTEXT,
(PVOID)&pRemoteCertContext);
if(Status != SEC_E_OK) {
printf("Error 0x%x querying remote certificate\n", Status);
goto cleanup;
}
// Attempt to validate server certificate.
Status = verify_server_certificate(pRemoteCertContext, host,0);
if(Status) {
// The server certificate did not validate correctly. At this
// point, we cannot tell if we are connecting to the correct
// server, or if we are connecting to a "man in the middle"
// attack server.
// It is therefore best if we abort the connection.
printf("Error 0x%x authenticating server credentials!\n", Status);
// goto cleanup;
}
void vschannel_cleanup() {
// Free the server certificate context.
CertFreeCertificateContext(pRemoteCertContext);
pRemoteCertContext = NULL;
// Request from server
if(https_make_request(Socket, &hClientCreds, &hContext, req, out, &resp_length)) {
goto cleanup;
} else
// Send a close_notify alert to the server and
// close down the connection.
if(disconnect_from_server(Socket, &hClientCreds, &hContext)) {
printf("Error disconnecting from server\n");
goto cleanup;
}
fContextInitialized = FALSE;
Socket = INVALID_SOCKET;
cleanup:
// Free the server certificate context.
if(pRemoteCertContext) {
CertFreeCertificateContext(pRemoteCertContext);
pRemoteCertContext = NULL;
if(tls_ctx.pRemoteCertContext) {
CertFreeCertificateContext(tls_ctx.pRemoteCertContext);
tls_ctx.pRemoteCertContext = NULL;
}
// Free SSPI context handle.
if(fContextInitialized) {
sspi->DeleteSecurityContext(&hContext);
fContextInitialized = FALSE;
if(tls_ctx.fContextInitialized) {
sspi->DeleteSecurityContext(&tls_ctx.hContext);
tls_ctx.fContextInitialized = FALSE;
}
// Free SSPI credentials handle.
if(fCredsInitialized) {
sspi->FreeCredentialsHandle(&hClientCreds);
fCredsInitialized = FALSE;
if(tls_ctx.fCredsInitialized) {
sspi->FreeCredentialsHandle(&tls_ctx.hClientCreds);
tls_ctx.fCredsInitialized = FALSE;
}
// Close socket.
if(Socket != INVALID_SOCKET) {
closesocket(Socket);
if(tls_ctx.Socket != INVALID_SOCKET) {
closesocket(tls_ctx.Socket);
}
// Shutdown WinSock subsystem.
@ -196,6 +111,105 @@ cleanup:
}
unload_security_library();
}
void vschannel_init() {
tls_ctx = new_tls_context();
if(!load_security_library()) {
printf("Error initializing the security library\n");
vschannel_cleanup();
}
// Initialize the WinSock subsystem.
if(WSAStartup(0x0101, &tls_ctx.WsaData) == SOCKET_ERROR) {
printf("Error %d returned by WSAStartup\n", GetLastError());
vschannel_cleanup();
}
// Create credentials.
if(create_credentials(&tls_ctx.hClientCreds)) {
printf("Error creating credentials\n");
vschannel_cleanup();
}
tls_ctx.fCredsInitialized = TRUE;
}
INT request(CHAR *host, CHAR *req, CHAR *out)
{
SecBuffer ExtraData;
SECURITY_STATUS Status;
INT i;
INT iOption;
PCHAR pszOption;
INT resp_length = 0;
protocol = SP_PROT_TLS1_2_CLIENT;
// Connect to server.
if(connect_to_server(host, port_number, &tls_ctx.Socket)) {
printf("Error connecting to server\n");
vschannel_cleanup();
return resp_length;
}
// Perform handshake
if(perform_client_handshake(tls_ctx.Socket, &tls_ctx.hClientCreds, host, &tls_ctx.hContext, &ExtraData)) {
printf("Error performing handshake\n");
vschannel_cleanup();
return resp_length;
}
tls_ctx.fContextInitialized = TRUE;
// Authenticate server's credentials.
// Get server's certificate.
Status = sspi->QueryContextAttributes(&tls_ctx.hContext,
SECPKG_ATTR_REMOTE_CERT_CONTEXT,
(PVOID)&tls_ctx.pRemoteCertContext);
if(Status != SEC_E_OK) {
printf("Error 0x%x querying remote certificate\n", Status);
vschannel_cleanup();
return resp_length;
}
// Attempt to validate server certificate.
Status = verify_server_certificate(tls_ctx.pRemoteCertContext, host,0);
if(Status) {
// The server certificate did not validate correctly. At this
// point, we cannot tell if we are connecting to the correct
// server, or if we are connecting to a "man in the middle"
// attack server.
// It is therefore best if we abort the connection.
printf("Error 0x%x authenticating server credentials!\n", Status);
vschannel_cleanup();
return resp_length;
}
// Free the server certificate context.
CertFreeCertificateContext(tls_ctx.pRemoteCertContext);
tls_ctx.pRemoteCertContext = NULL;
// Request from server
if(https_make_request(tls_ctx.Socket, &tls_ctx.hClientCreds, &tls_ctx.hContext, req, out, &resp_length)) {
vschannel_cleanup();
return resp_length;
}
// Send a close_notify alert to the server and
// close down the connection.
if(disconnect_from_server(tls_ctx.Socket, &tls_ctx.hClientCreds, &tls_ctx.hContext)) {
printf("Error disconnecting from server\n");
vschannel_cleanup();
return resp_length;
}
tls_ctx.fContextInitialized = FALSE;
tls_ctx.Socket = INVALID_SOCKET;
return resp_length;
}
@ -936,8 +950,8 @@ static SECURITY_STATUS https_make_request(SOCKET Socket, PCredHandle phCreds, Ct
}
// Copy the decrypted data to our output buffer
memcpy(out, pDataBuffer->pvBuffer, (int)pDataBuffer->cbBuffer);
*length += (int)pDataBuffer->cbBuffer;
memcpy(out, pDataBuffer->pvBuffer, (int)pDataBuffer->cbBuffer);
out += (int)pDataBuffer->cbBuffer;
// Move any "extra" data to the input buffer.

9
thirdparty/vschannel/vschannel.h vendored
View File

@ -19,7 +19,13 @@
#define SP_PROT_TLS1_2_CLIENT 0x00000800
INT request(CHAR *host, CHAR *req, CHAR *out);
static struct TlsContext new_tls_context();
static void vschannel_init();
static void vschannel_cleanup();
static INT request(CHAR *host, CHAR *req, CHAR *out);
static SECURITY_STATUS create_credentials(PCredHandle phCreds);
@ -36,7 +42,6 @@ static SECURITY_STATUS client_handshake_loop(
static SECURITY_STATUS https_make_request(
SOCKET Socket, PCredHandle phCreds,
CtxtHandle *phContext, CHAR *req, CHAR *out, int *length);
// CtxtHandle *phContext, CHAR *path);
static DWORD verify_server_certificate(
PCCERT_CONTEXT pServerCert, PSTR host, DWORD dwCertFlags);

9
vlib/http/backend_nix.v
View File

@ -31,7 +31,7 @@ fn init_module() {
//C.OPENSSL_config(0)
}
fn ssl_do(method, host_name, path string) string {
fn ssl_do(method, host_name, path string) Response {
//ssl_method := C.SSLv23_method()
ssl_method := C.TLSv1_2_method()
if isnil(method) {
@ -67,9 +67,7 @@ fn ssl_do(method, host_name, path string) string {
cert := C.SSL_get_peer_certificate(ssl)
res = C.SSL_get_verify_result(ssl)
///////
s := '$method $path HTTP/1.1\r\n' +
'Host: $host_name\r\n' +
'Connection: close\r\n\r\n'
s := build_request_headers('', method, host_name, path)
C.BIO_puts(web, s.str)
C.BIO_puts(out, '\n')
mut sb := strings.new_builder(100)
@ -92,5 +90,6 @@ fn ssl_do(method, host_name, path string) string {
if !isnil(ctx) {
C.SSL_CTX_free(ctx)
}
return sb.str()
return parse_response(sb.str() )
}

34
vlib/http/backend_win.v
View File

@ -5,27 +5,43 @@
module http
import strings
import net.urllib
#flag windows -I @VROOT/thirdparty/vschannel
#flag -lws2_32 -lcrypt32
#flag -l ws2_32
#flag -l crypt32
#include "vschannel.c"
const (
max_redirects = 4
)
fn init_module() {}
fn ssl_do(method, host_name, path string) string {
mut buff := malloc(10000)
fn ssl_do(method, host_name, path string) Response {
C.vschannel_init()
// TODO: joe-c
// dynamically increase in vschannel.c if needed
mut buff := malloc(44000)
req := '$method $path HTTP/1.0\r\nUser-Agent: v\r\nAccept:*/*\r\n\r\n'
length := int(C.request(host_name.str, req.str, buff))
mut p := if path == '' { '/' } else { path }
mut req := build_request_headers('', method, host_name, p)
mut length := int(C.request(host_name.str, req.str, buff))
mut resp := parse_response(string(buff, length))
if length == 0 {
return ''
mut no_redirects := 0
for resp.status_code == 301 && no_redirects <= max_redirects {
u := urllib.parse(resp.headers['Location']) or { break }
p = if u.path == '' { '/' } else { u.path }
req = build_request_headers('', method, u.hostname(), p)
length = int(C.request(u.hostname().str, req.str, buff))
resp = parse_response(string(buff, length))
no_redirects++
}
resp := tos(buff, length)
free(buff)
C.vschannel_cleanup()
return resp
}

27
vlib/http/http.v
View File

@ -93,7 +93,6 @@ pub fn (req mut Request) add_header(key, val string) {
}
pub fn (req &Request) do() Response {
mut headers := map[string]string{}
if req.typ == 'POST' {
// req.headers << 'Content-Type: application/x-www-form-urlencoded'
}
@ -108,9 +107,13 @@ pub fn (req &Request) do() Response {
if !is_ssl {
panic('non https requests are not supported right now')
}
s := ssl_do(req.typ, url.host, url.path)
// s := ssl_do(req.typ, url.host, url.path)
first_header := s.all_before('\n')
return ssl_do(req.typ, url.hostname(), url.path)
}
fn parse_response(resp string) Response {
mut headers := map[string]string{}
first_header := resp.all_before('\n')
mut status_code := 0
if first_header.contains('HTTP/') {
val := first_header.find_between(' ', ' ')
@ -122,14 +125,14 @@ pub fn (req &Request) do() Response {
mut i := 1
for {
old_pos := nl_pos
nl_pos = s.index_after('\n', nl_pos+1)
nl_pos = resp.index_after('\n', nl_pos+1)
if nl_pos == -1 {
break
}
h := s.substr(old_pos + 1, nl_pos)
h := resp.substr(old_pos + 1, nl_pos)
// End of headers
if h.len <= 1 {
text = s.right(nl_pos + 1)
text = resp.right(nl_pos + 1)
break
}
i++
@ -144,9 +147,11 @@ pub fn (req &Request) do() Response {
val := h.right(pos + 2)
headers[key] = val.trim_space()
}
if headers['Transfer-Encoding'] == 'chunked' {
text = chunked.decode( text )
}
return Response {
status_code: status_code
headers: headers
@ -154,6 +159,14 @@ pub fn (req &Request) do() Response {
}
}
fn build_request_headers(user_agent, method, host_name, path string) string {
ua := if user_agent == '' { 'v' } else { user_agent }
return '$method $path HTTP/1.1\r\n' +
'Host: $host_name\r\n' +
'User-Agent: $ua\r\n' +
'Connection: close\r\n\r\n'
}
pub fn unescape_url(s string) string {
panic('http.unescape_url() was replaced with urllib.query_unescape()')
return ''